Bug 444188: Fix concurrent access to listener collectionsI20180515-0800

EclipsePreferences is now thread-safe.

A new test bundle is created to test org.eclipse.equinox.preferences
Moving tests from
org.eclipse.core.tests.internal.preferences.EclipsePreferencesTest is
not done here.


Signed-off-by: Vasili Gulevich <vasili.gulevich@xored.com>
Signed-off-by: Michelle Stolwyk <Michelle.Stolwyk@intersystems.com>
Change-Id: Ie3f264a2b7766e574bf65ca0cba3648ce76ac458

16 files changed, 833 insertions, 10 deletions

diff --git a/bundles/org.eclipse.equinox.preferences.tests/.classpath b/bundles/org.eclipse.equinox.preferences.tests/.classpath
new file mode 100644
index 000000000..098194ca4
--- /dev/null
+++ b/bundles/org.eclipse.equinox.preferences.tests/.classpath
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.7"/>
+	<classpathentry kind="con" path="org.eclipse.pde.core.requiredPlugins"/>
+	<classpathentry kind="src" path="src"/>
+	<classpathentry kind="output" path="bin"/>
+</classpath>
diff --git a/bundles/org.eclipse.equinox.preferences.tests/.gitignore b/bundles/org.eclipse.equinox.preferences.tests/.gitignore
new file mode 100644
index 000000000..f02e6a763
--- /dev/null
+++ b/bundles/org.eclipse.equinox.preferences.tests/.gitignore
@@ -0,0 +1 @@
+/scr_test
diff --git a/bundles/org.eclipse.equinox.preferences.tests/.project b/bundles/org.eclipse.equinox.preferences.tests/.project
new file mode 100644
index 000000000..e46696a44
--- /dev/null
+++ b/bundles/org.eclipse.equinox.preferences.tests/.project
@@ -0,0 +1,33 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>org.eclipse.equinox.preferences.tests</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>org.eclipse.pde.ManifestBuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>org.eclipse.pde.SchemaBuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>org.eclipse.pde.ds.core.builder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.pde.PluginNature</nature>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+	</natures>
+</projectDescription>
diff --git a/bundles/org.eclipse.equinox.preferences.tests/.settings/org.eclipse.core.runtime.prefs b/bundles/org.eclipse.equinox.preferences.tests/.settings/org.eclipse.core.runtime.prefs
new file mode 100644
index 000000000..5a0ad22d2
--- /dev/null
+++ b/bundles/org.eclipse.equinox.preferences.tests/.settings/org.eclipse.core.runtime.prefs
@@ -0,0 +1,2 @@
+eclipse.preferences.version=1
+line.separator=\n
diff --git a/bundles/org.eclipse.equinox.preferences.tests/.settings/org.eclipse.jdt.core.prefs b/bundles/org.eclipse.equinox.preferences.tests/.settings/org.eclipse.jdt.core.prefs
new file mode 100644
index 000000000..285300b1a
--- /dev/null
+++ b/bundles/org.eclipse.equinox.preferences.tests/.settings/org.eclipse.jdt.core.prefs
@@ -0,0 +1,112 @@
+eclipse.preferences.version=1
+org.eclipse.jdt.core.builder.cleanOutputFolder=clean
+org.eclipse.jdt.core.builder.duplicateResourceTask=warning
+org.eclipse.jdt.core.builder.invalidClasspath=abort
+org.eclipse.jdt.core.builder.recreateModifiedClassFileInOutputFolder=ignore
+org.eclipse.jdt.core.builder.resourceCopyExclusionFilter=*.launch
+org.eclipse.jdt.core.circularClasspath=error
+org.eclipse.jdt.core.classpath.exclusionPatterns=enabled
+org.eclipse.jdt.core.classpath.multipleOutputLocations=enabled
+org.eclipse.jdt.core.compiler.annotation.inheritNullAnnotations=disabled
+org.eclipse.jdt.core.compiler.annotation.missingNonNullByDefaultAnnotation=ignore
+org.eclipse.jdt.core.compiler.annotation.nonnull=org.eclipse.jdt.annotation.NonNull
+org.eclipse.jdt.core.compiler.annotation.nonnullbydefault=org.eclipse.jdt.annotation.NonNullByDefault
+org.eclipse.jdt.core.compiler.annotation.nullable=org.eclipse.jdt.annotation.Nullable
+org.eclipse.jdt.core.compiler.annotation.nullanalysis=disabled
+org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
+org.eclipse.jdt.core.compiler.codegen.methodParameters=do not generate
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.7
+org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
+org.eclipse.jdt.core.compiler.compliance=1.7
+org.eclipse.jdt.core.compiler.debug.lineNumber=generate
+org.eclipse.jdt.core.compiler.debug.localVariable=generate
+org.eclipse.jdt.core.compiler.debug.sourceFile=generate
+org.eclipse.jdt.core.compiler.maxProblemPerUnit=100
+org.eclipse.jdt.core.compiler.problem.annotationSuperInterface=warning
+org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
+org.eclipse.jdt.core.compiler.problem.autoboxing=ignore
+org.eclipse.jdt.core.compiler.problem.comparingIdentical=warning
+org.eclipse.jdt.core.compiler.problem.deadCode=warning
+org.eclipse.jdt.core.compiler.problem.deprecation=warning
+org.eclipse.jdt.core.compiler.problem.deprecationInDeprecatedCode=disabled
+org.eclipse.jdt.core.compiler.problem.deprecationWhenOverridingDeprecatedMethod=disabled
+org.eclipse.jdt.core.compiler.problem.discouragedReference=warning
+org.eclipse.jdt.core.compiler.problem.emptyStatement=ignore
+org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
+org.eclipse.jdt.core.compiler.problem.explicitlyClosedAutoCloseable=ignore
+org.eclipse.jdt.core.compiler.problem.fallthroughCase=ignore
+org.eclipse.jdt.core.compiler.problem.fatalOptionalError=disabled
+org.eclipse.jdt.core.compiler.problem.fieldHiding=ignore
+org.eclipse.jdt.core.compiler.problem.finalParameterBound=ignore
+org.eclipse.jdt.core.compiler.problem.finallyBlockNotCompletingNormally=warning
+org.eclipse.jdt.core.compiler.problem.forbiddenReference=error
+org.eclipse.jdt.core.compiler.problem.hiddenCatchBlock=warning
+org.eclipse.jdt.core.compiler.problem.includeNullInfoFromAsserts=disabled
+org.eclipse.jdt.core.compiler.problem.incompatibleNonInheritedInterfaceMethod=warning
+org.eclipse.jdt.core.compiler.problem.incompleteEnumSwitch=warning
+org.eclipse.jdt.core.compiler.problem.indirectStaticAccess=ignore
+org.eclipse.jdt.core.compiler.problem.localVariableHiding=ignore
+org.eclipse.jdt.core.compiler.problem.methodWithConstructorName=warning
+org.eclipse.jdt.core.compiler.problem.missingDefaultCase=ignore
+org.eclipse.jdt.core.compiler.problem.missingDeprecatedAnnotation=ignore
+org.eclipse.jdt.core.compiler.problem.missingEnumCaseDespiteDefault=disabled
+org.eclipse.jdt.core.compiler.problem.missingHashCodeMethod=ignore
+org.eclipse.jdt.core.compiler.problem.missingOverrideAnnotation=ignore
+org.eclipse.jdt.core.compiler.problem.missingOverrideAnnotationForInterfaceMethodImplementation=enabled
+org.eclipse.jdt.core.compiler.problem.missingSerialVersion=warning
+org.eclipse.jdt.core.compiler.problem.missingSynchronizedOnInheritedMethod=ignore
+org.eclipse.jdt.core.compiler.problem.noEffectAssignment=warning
+org.eclipse.jdt.core.compiler.problem.noImplicitStringConversion=warning
+org.eclipse.jdt.core.compiler.problem.nonExternalizedStringLiteral=ignore
+org.eclipse.jdt.core.compiler.problem.nonnullParameterAnnotationDropped=warning
+org.eclipse.jdt.core.compiler.problem.nullAnnotationInferenceConflict=error
+org.eclipse.jdt.core.compiler.problem.nullReference=warning
+org.eclipse.jdt.core.compiler.problem.nullSpecViolation=error
+org.eclipse.jdt.core.compiler.problem.nullUncheckedConversion=warning
+org.eclipse.jdt.core.compiler.problem.overridingPackageDefaultMethod=warning
+org.eclipse.jdt.core.compiler.problem.parameterAssignment=ignore
+org.eclipse.jdt.core.compiler.problem.possibleAccidentalBooleanAssignment=ignore
+org.eclipse.jdt.core.compiler.problem.potentialNullReference=ignore
+org.eclipse.jdt.core.compiler.problem.potentiallyUnclosedCloseable=ignore
+org.eclipse.jdt.core.compiler.problem.rawTypeReference=ignore
+org.eclipse.jdt.core.compiler.problem.redundantNullAnnotation=warning
+org.eclipse.jdt.core.compiler.problem.redundantNullCheck=ignore
+org.eclipse.jdt.core.compiler.problem.redundantSpecificationOfTypeArguments=ignore
+org.eclipse.jdt.core.compiler.problem.redundantSuperinterface=ignore
+org.eclipse.jdt.core.compiler.problem.reportMethodCanBePotentiallyStatic=ignore
+org.eclipse.jdt.core.compiler.problem.reportMethodCanBeStatic=ignore
+org.eclipse.jdt.core.compiler.problem.specialParameterHidingField=disabled
+org.eclipse.jdt.core.compiler.problem.staticAccessReceiver=warning
+org.eclipse.jdt.core.compiler.problem.suppressOptionalErrors=disabled
+org.eclipse.jdt.core.compiler.problem.suppressWarnings=enabled
+org.eclipse.jdt.core.compiler.problem.syntacticNullAnalysisForFields=disabled
+org.eclipse.jdt.core.compiler.problem.syntheticAccessEmulation=ignore
+org.eclipse.jdt.core.compiler.problem.typeParameterHiding=warning
+org.eclipse.jdt.core.compiler.problem.unavoidableGenericTypeProblems=enabled
+org.eclipse.jdt.core.compiler.problem.uncheckedTypeOperation=ignore
+org.eclipse.jdt.core.compiler.problem.unclosedCloseable=warning
+org.eclipse.jdt.core.compiler.problem.undocumentedEmptyBlock=ignore
+org.eclipse.jdt.core.compiler.problem.unhandledWarningToken=warning
+org.eclipse.jdt.core.compiler.problem.unnecessaryElse=ignore
+org.eclipse.jdt.core.compiler.problem.unnecessaryTypeCheck=ignore
+org.eclipse.jdt.core.compiler.problem.unqualifiedFieldAccess=ignore
+org.eclipse.jdt.core.compiler.problem.unusedDeclaredThrownException=ignore
+org.eclipse.jdt.core.compiler.problem.unusedDeclaredThrownExceptionExemptExceptionAndThrowable=enabled
+org.eclipse.jdt.core.compiler.problem.unusedDeclaredThrownExceptionIncludeDocCommentReference=enabled
+org.eclipse.jdt.core.compiler.problem.unusedDeclaredThrownExceptionWhenOverriding=disabled
+org.eclipse.jdt.core.compiler.problem.unusedImport=warning
+org.eclipse.jdt.core.compiler.problem.unusedLabel=warning
+org.eclipse.jdt.core.compiler.problem.unusedLocal=warning
+org.eclipse.jdt.core.compiler.problem.unusedObjectAllocation=ignore
+org.eclipse.jdt.core.compiler.problem.unusedParameter=ignore
+org.eclipse.jdt.core.compiler.problem.unusedParameterIncludeDocCommentReference=enabled
+org.eclipse.jdt.core.compiler.problem.unusedParameterWhenImplementingAbstract=disabled
+org.eclipse.jdt.core.compiler.problem.unusedParameterWhenOverridingConcrete=disabled
+org.eclipse.jdt.core.compiler.problem.unusedPrivateMember=warning
+org.eclipse.jdt.core.compiler.problem.unusedTypeParameter=ignore
+org.eclipse.jdt.core.compiler.problem.unusedWarningToken=warning
+org.eclipse.jdt.core.compiler.problem.varargsArgumentNeedCast=warning
+org.eclipse.jdt.core.compiler.source=1.7
+org.eclipse.jdt.core.incompatibleJDKLevel=ignore
+org.eclipse.jdt.core.incompleteClasspath=error
+org.eclipse.objectteams.otdt.compiler.option.pure_java=enabled
diff --git a/bundles/org.eclipse.equinox.preferences.tests/.settings/org.eclipse.jdt.ui.prefs b/bundles/org.eclipse.equinox.preferences.tests/.settings/org.eclipse.jdt.ui.prefs
new file mode 100644
index 000000000..a970245bf
--- /dev/null
+++ b/bundles/org.eclipse.equinox.preferences.tests/.settings/org.eclipse.jdt.ui.prefs
@@ -0,0 +1,3 @@
+#Mon Dec 15 14:14:24 EET 2008
+eclipse.preferences.version=1
+org.eclipse.jdt.ui.text.custom_code_templates=<?xml version\="1.0" encoding\="UTF-8" standalone\="no"?><templates/>
diff --git a/bundles/org.eclipse.equinox.preferences.tests/.settings/org.eclipse.pde.core.prefs b/bundles/org.eclipse.equinox.preferences.tests/.settings/org.eclipse.pde.core.prefs
new file mode 100644
index 000000000..f38a61e2f
--- /dev/null
+++ b/bundles/org.eclipse.equinox.preferences.tests/.settings/org.eclipse.pde.core.prefs
@@ -0,0 +1,4 @@
+#Tue Nov 11 12:04:55 EET 2008
+eclipse.preferences.version=1
+pluginProject.extensions=false
+resolve.requirebundle=false
diff --git a/bundles/org.eclipse.equinox.preferences.tests/All Preferences Tests.launch b/bundles/org.eclipse.equinox.preferences.tests/All Preferences Tests.launch
new file mode 100644
index 000000000..dd18c247e
--- /dev/null
+++ b/bundles/org.eclipse.equinox.preferences.tests/All Preferences Tests.launch
@@ -0,0 +1,431 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<launchConfiguration type="org.eclipse.pde.ui.JunitLaunchConfig">
+<booleanAttribute key="append.args" value="true"/>
+<stringAttribute key="application" value="org.eclipse.pde.junit.runtime.coretestapplication"/>
+<booleanAttribute key="askclear" value="false"/>
+<booleanAttribute key="automaticAdd" value="true"/>
+<booleanAttribute key="automaticValidate" value="false"/>
+<stringAttribute key="bootstrap" value=""/>
+<stringAttribute key="checked" value="[NONE]"/>
+<booleanAttribute key="clearConfig" value="true"/>
+<booleanAttribute key="clearws" value="true"/>
+<booleanAttribute key="clearwslog" value="false"/>
+<stringAttribute key="configLocation" value="${workspace_loc}/.metadata/.plugins/org.eclipse.pde.core/pde-junit"/>
+<booleanAttribute key="default" value="true"/>
+<booleanAttribute key="includeOptional" value="true"/>
+<stringAttribute key="location" value="${workspace_loc}/../junit-workspace"/>
+<listAttribute key="org.eclipse.debug.core.MAPPED_RESOURCE_PATHS">
+<listEntry value="/org.eclipse.equinox.preferences.tests"/>
+</listAttribute>
+<listAttribute key="org.eclipse.debug.core.MAPPED_RESOURCE_TYPES">
+<listEntry value="4"/>
+</listAttribute>
+<stringAttribute key="org.eclipse.debug.core.source_locator_id" value="org.eclipse.pde.ui.launcher.PDESourceLookupDirector"/>
+<stringAttribute key="org.eclipse.debug.core.source_locator_memento" value="&lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot; standalone=&quot;no&quot;?&gt;&#13;&#10;&lt;sourceLookupDirector&gt;&#13;&#10;&lt;sourceContainers duplicates=&quot;false&quot;&gt;&#13;&#10;&lt;container memento=&quot;&amp;lt;?xml version=&amp;quot;1.0&amp;quot; encoding=&amp;quot;UTF-8&amp;quot; standalone=&amp;quot;no&amp;quot;?&amp;gt;&amp;#13;&amp;#10;&amp;lt;javaProject name=&amp;quot;org.eclipse.osgi&amp;quot;/&amp;gt;&amp;#13;&amp;#10;&quot; typeId=&quot;org.eclipse.jdt.launching.sourceContainer.javaProject&quot;/&gt;&#13;&#10;&lt;container memento=&quot;&amp;lt;?xml version=&amp;quot;1.0&amp;quot; encoding=&amp;quot;UTF-8&amp;quot; standalone=&amp;quot;no&amp;quot;?&amp;gt;&amp;#13;&amp;#10;&amp;lt;default/&amp;gt;&amp;#13;&amp;#10;&quot; typeId=&quot;org.eclipse.debug.core.containerType.default&quot;/&gt;&#13;&#10;&lt;/sourceContainers&gt;&#13;&#10;&lt;/sourceLookupDirector&gt;&#13;&#10;"/>
+<stringAttribute key="org.eclipse.jdt.junit.CONTAINER" value="=org.eclipse.equinox.preferences.tests"/>
+<booleanAttribute key="org.eclipse.jdt.junit.KEEPRUNNING_ATTR" value="false"/>
+<stringAttribute key="org.eclipse.jdt.junit.TESTNAME" value=""/>
+<stringAttribute key="org.eclipse.jdt.junit.TEST_KIND" value="org.eclipse.jdt.junit.loader.junit4"/>
+<stringAttribute key="org.eclipse.jdt.launching.JRE_CONTAINER" value="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8"/>
+<stringAttribute key="org.eclipse.jdt.launching.MAIN_TYPE" value=""/>
+<stringAttribute key="org.eclipse.jdt.launching.PROGRAM_ARGUMENTS" value="-os ${target.os} -ws ${target.ws} -arch ${target.arch} -nl ${target.nl} -consoleLog"/>
+<stringAttribute key="org.eclipse.jdt.launching.PROJECT_ATTR" value="org.eclipse.equinox.preferences.tests"/>
+<stringAttribute key="org.eclipse.jdt.launching.SOURCE_PATH_PROVIDER" value="org.eclipse.pde.ui.workbenchClasspathProvider"/>
+<stringAttribute key="pde.version" value="3.3"/>
+<stringAttribute key="product" value="org.eclipse.sdk.ide"/>
+<booleanAttribute key="run_in_ui_thread" value="false"/>
+<booleanAttribute key="show_selected_only" value="false"/>
+<stringAttribute key="templateConfig" value="${target_home}\configuration\config.ini"/>
+<booleanAttribute key="tracing" value="false"/>
+<mapAttribute key="tracingOptions">
+<mapEntry key="com.mountainminds.eclemma.core/debug/analysis" value="true"/>
+<mapEntry key="com.mountainminds.eclemma.core/debug/emmaVerbosityLevel" value="info"/>
+<mapEntry key="com.mountainminds.eclemma.core/debug/instrumentation" value="true"/>
+<mapEntry key="com.mountainminds.eclemma.core/debug/launching" value="true"/>
+<mapEntry key="com.mountainminds.eclemma.core/debug/performance" value="true"/>
+<mapEntry key="org.eclipse.birt.chart.engine/aggregate" value="false"/>
+<mapEntry key="org.eclipse.birt.chart.engine/computation" value="false"/>
+<mapEntry key="org.eclipse.birt.chart.engine/computation.withaxes" value="false"/>
+<mapEntry key="org.eclipse.birt.chart.engine/computation.withoutaxes" value="false"/>
+<mapEntry key="org.eclipse.birt.chart.engine/datafeed" value="false"/>
+<mapEntry key="org.eclipse.birt.chart.engine/debug" value="false"/>
+<mapEntry key="org.eclipse.birt.chart.engine/device" value="false"/>
+<mapEntry key="org.eclipse.birt.chart.engine/engine.i18n" value="false"/>
+<mapEntry key="org.eclipse.birt.chart.engine/event" value="false"/>
+<mapEntry key="org.eclipse.birt.chart.engine/exception" value="false"/>
+<mapEntry key="org.eclipse.birt.chart.engine/factory" value="false"/>
+<mapEntry key="org.eclipse.birt.chart.engine/internal" value="false"/>
+<mapEntry key="org.eclipse.birt.chart.engine/internal.computations" value="false"/>
+<mapEntry key="org.eclipse.birt.chart.engine/internal.factory" value="false"/>
+<mapEntry key="org.eclipse.birt.chart.engine/internal.script" value="false"/>
+<mapEntry key="org.eclipse.birt.chart.engine/log" value="false"/>
+<mapEntry key="org.eclipse.birt.chart.engine/log.impl" value="false"/>
+<mapEntry key="org.eclipse.birt.chart.engine/model" value="false"/>
+<mapEntry key="org.eclipse.birt.chart.engine/model.attribute" value="false"/>
+<mapEntry key="org.eclipse.birt.chart.engine/model.attribute.impl" value="false"/>
+<mapEntry key="org.eclipse.birt.chart.engine/model.attribute.util" value="false"/>
+<mapEntry key="org.eclipse.birt.chart.engine/model.component" value="false"/>
+<mapEntry key="org.eclipse.birt.chart.engine/model.component.impl" value="false"/>
+<mapEntry key="org.eclipse.birt.chart.engine/model.component.util" value="false"/>
+<mapEntry key="org.eclipse.birt.chart.engine/model.data" value="false"/>
+<mapEntry key="org.eclipse.birt.chart.engine/model.data.impl" value="false"/>
+<mapEntry key="org.eclipse.birt.chart.engine/model.data.util" value="false"/>
+<mapEntry key="org.eclipse.birt.chart.engine/model.impl" value="false"/>
+<mapEntry key="org.eclipse.birt.chart.engine/model.layout" value="false"/>
+<mapEntry key="org.eclipse.birt.chart.engine/model.layout.impl" value="false"/>
+<mapEntry key="org.eclipse.birt.chart.engine/model.layout.util" value="false"/>
+<mapEntry key="org.eclipse.birt.chart.engine/model.prefs" value="false"/>
+<mapEntry key="org.eclipse.birt.chart.engine/model.type" value="false"/>
+<mapEntry key="org.eclipse.birt.chart.engine/model.type.impl" value="false"/>
+<mapEntry key="org.eclipse.birt.chart.engine/model.type.util" value="false"/>
+<mapEntry key="org.eclipse.birt.chart.engine/model.util" value="false"/>
+<mapEntry key="org.eclipse.birt.chart.engine/plugin" value="false"/>
+<mapEntry key="org.eclipse.birt.chart.engine/render" value="false"/>
+<mapEntry key="org.eclipse.birt.chart.engine/script" value="false"/>
+<mapEntry key="org.eclipse.birt.chart.engine/style" value="false"/>
+<mapEntry key="org.eclipse.birt.chart.engine/trace" value="false"/>
+<mapEntry key="org.eclipse.birt.chart.engine/util" value="false"/>
+<mapEntry key="org.eclipse.birt.core/debug" value="false"/>
+<mapEntry key="org.eclipse.core.contenttype/debug" value="false"/>
+<mapEntry key="org.eclipse.core.expressions/tracePropertyResolving" value="false"/>
+<mapEntry key="org.eclipse.core.jobs/jobs" value="false"/>
+<mapEntry key="org.eclipse.core.jobs/jobs/beginend" value="false"/>
+<mapEntry key="org.eclipse.core.jobs/jobs/errorondeadlock" value="false"/>
+<mapEntry key="org.eclipse.core.jobs/jobs/locks" value="false"/>
+<mapEntry key="org.eclipse.core.jobs/jobs/shutdown" value="false"/>
+<mapEntry key="org.eclipse.core.jobs/jobs/timing" value="false"/>
+<mapEntry key="org.eclipse.core.resources/build/delta" value="false"/>
+<mapEntry key="org.eclipse.core.resources/build/failure" value="false"/>
+<mapEntry key="org.eclipse.core.resources/build/interrupt" value="false"/>
+<mapEntry key="org.eclipse.core.resources/build/invoking" value="false"/>
+<mapEntry key="org.eclipse.core.resources/build/needbuild" value="false"/>
+<mapEntry key="org.eclipse.core.resources/build/needbuildstack" value="false"/>
+<mapEntry key="org.eclipse.core.resources/build/stacktrace" value="false"/>
+<mapEntry key="org.eclipse.core.resources/contenttype" value="false"/>
+<mapEntry key="org.eclipse.core.resources/contenttype/cache" value="false"/>
+<mapEntry key="org.eclipse.core.resources/debug" value="false"/>
+<mapEntry key="org.eclipse.core.resources/history" value="false"/>
+<mapEntry key="org.eclipse.core.resources/natures" value="false"/>
+<mapEntry key="org.eclipse.core.resources/perf/builders" value="10000"/>
+<mapEntry key="org.eclipse.core.resources/perf/listeners" value="500"/>
+<mapEntry key="org.eclipse.core.resources/perf/save.participants" value="500"/>
+<mapEntry key="org.eclipse.core.resources/perf/snapshot" value="1000"/>
+<mapEntry key="org.eclipse.core.resources/preferences" value="false"/>
+<mapEntry key="org.eclipse.core.resources/refresh" value="false"/>
+<mapEntry key="org.eclipse.core.resources/restore" value="false"/>
+<mapEntry key="org.eclipse.core.resources/restore/markers" value="false"/>
+<mapEntry key="org.eclipse.core.resources/restore/mastertable" value="false"/>
+<mapEntry key="org.eclipse.core.resources/restore/metainfo" value="false"/>
+<mapEntry key="org.eclipse.core.resources/restore/snapshots" value="false"/>
+<mapEntry key="org.eclipse.core.resources/restore/syncinfo" value="false"/>
+<mapEntry key="org.eclipse.core.resources/restore/tree" value="false"/>
+<mapEntry key="org.eclipse.core.resources/save" value="false"/>
+<mapEntry key="org.eclipse.core.resources/save/markers" value="false"/>
+<mapEntry key="org.eclipse.core.resources/save/mastertable" value="false"/>
+<mapEntry key="org.eclipse.core.resources/save/metainfo" value="false"/>
+<mapEntry key="org.eclipse.core.resources/save/syncinfo" value="false"/>
+<mapEntry key="org.eclipse.core.resources/save/tree" value="false"/>
+<mapEntry key="org.eclipse.core.resources/strings" value="false"/>
+<mapEntry key="org.eclipse.core.runtime/compatibility/debug" value="false"/>
+<mapEntry key="org.eclipse.core.runtime/debug" value="false"/>
+<mapEntry key="org.eclipse.core.runtime/debug/context" value="false"/>
+<mapEntry key="org.eclipse.core.runtime/perf" value="false"/>
+<mapEntry key="org.eclipse.core.runtime/perf/success" value="false"/>
+<mapEntry key="org.eclipse.core.runtime/preferences/plugin" value="false"/>
+<mapEntry key="org.eclipse.core.runtime/url/debug" value="false"/>
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diff --git a/bundles/org.eclipse.equinox.preferences.tests/META-INF/MANIFEST.MF b/bundles/org.eclipse.equinox.preferences.tests/META-INF/MANIFEST.MF
new file mode 100644
index 000000000..95468661c
--- /dev/null
+++ b/bundles/org.eclipse.equinox.preferences.tests/META-INF/MANIFEST.MF
@@ -0,0 +1,23 @@
+Manifest-Version: 1.0
+Bundle-ManifestVersion: 2
+Bundle-Name: Preferences Tests
+Bundle-Category: test
+Bundle-SymbolicName: org.eclipse.equinox.preferences.tests
+Bundle-Version: 3.7.100.qualifier
+Require-Bundle: org.junit
+Import-Package: 
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+ org.eclipse.core.runtime.jobs,
+ org.eclipse.core.runtime.preferences;version="3.3.0",
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+ org.osgi.service.component;version="1.0.0",
+ org.osgi.service.log;version="1.3.0",
+ org.osgi.service.permissionadmin;version="1.2.0",
+ org.osgi.service.prefs;version="1.1.1",
+ org.osgi.util.tracker;version="1.4.2"
+Bundle-RequiredExecutionEnvironment: JavaSE-1.7
+Eclipse-BundleShape: dir
+Automatic-Module-Name: org.eclipse.equinox.preferences.tests
diff --git a/bundles/org.eclipse.equinox.preferences.tests/about.html b/bundles/org.eclipse.equinox.preferences.tests/about.html
new file mode 100644
index 000000000..f3cc53613
--- /dev/null
+++ b/bundles/org.eclipse.equinox.preferences.tests/about.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
+    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml">
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"/>
+<title>About</title>
+</head>
+<body lang="EN-US">
+<h2>About This Content</h2>
+ 
+<p>January 30, 2010</p>	
+<h3>License</h3>
+
+<p>The Eclipse Foundation makes available all content in this plug-in (&quot;Content&quot;).  Unless otherwise 
+indicated below, the Content is provided to you under the terms and conditions of the
+Eclipse Public License Version 1.0 (&quot;EPL&quot;).  A copy of the EPL is available 
+at <a href="http://www.eclipse.org/legal/epl-v10.html">http://www.eclipse.org/legal/epl-v10.html</a>.
+For purposes of the EPL, &quot;Program&quot; will mean the Content.</p>
+
+<p>If you did not receive this Content directly from the Eclipse Foundation, the Content is 
+being redistributed by another party (&quot;Redistributor&quot;) and different terms and conditions may
+apply to your use of any object code in the Content.  Check the Redistributor's license that was 
+provided with the Content.  If no such license exists, contact the Redistributor.  Unless otherwise
+indicated below, the terms and conditions of the EPL still apply to any source code in the Content
+and such source code may be obtained at <a href="http://www.eclipse.org">http://www.eclipse.org</a>.</p>
+
+</body>
+</html>
\ No newline at end of file
diff --git a/bundles/org.eclipse.equinox.preferences.tests/build.properties b/bundles/org.eclipse.equinox.preferences.tests/build.properties
new file mode 100644
index 000000000..e1abefcfc
--- /dev/null
+++ b/bundles/org.eclipse.equinox.preferences.tests/build.properties
@@ -0,0 +1,17 @@
+###############################################################################
+# Copyright (c) 2018 InterSystems Corporation and others.
+# All rights reserved. This program and the accompanying materials
+# are made available under the terms of the Eclipse Public License v1.0
+# which accompanies this distribution, and is available at
+# http://www.eclipse.org/legal/epl-v10.html
+#
+# Contributors:
+#     InterSystems Corporation - tests for Bug 444188
+###############################################################################
+source.. = src/
+bin.includes = META-INF/,\
+               .,\
+               test.xml,\
+               about.html
+jars.compile.order = .
+
diff --git a/bundles/org.eclipse.equinox.preferences.tests/forceQualifierUpdate.txt b/bundles/org.eclipse.equinox.preferences.tests/forceQualifierUpdate.txt
new file mode 100644
index 000000000..a906c21b6
--- /dev/null
+++ b/bundles/org.eclipse.equinox.preferences.tests/forceQualifierUpdate.txt
@@ -0,0 +1,2 @@
+# To force a version qualifier update add the bug here
+Bug 444188 - Fix EclipsePreferences concurrency bug on listener collection access 
diff --git a/bundles/org.eclipse.equinox.preferences.tests/pom.xml b/bundles/org.eclipse.equinox.preferences.tests/pom.xml
new file mode 100644
index 000000000..b60ec524f
--- /dev/null
+++ b/bundles/org.eclipse.equinox.preferences.tests/pom.xml
@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  Copyright (c) 2018 InterSystems Corporation and others.
+  All rights reserved. This program and the accompanying materials
+  are made available under the terms of the Eclipse Public License v1.0
+  which accompanies this distribution, and is available at
+  http://www.eclipse.org/legal/epl-v10.html
+
+  Contributors:
+      InterSystems Corporation - tests for Bug 444188
+-->
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <parent>
+    <artifactId>tests-pom</artifactId>
+    <groupId>org.eclipse.equinox.bundles</groupId>
+    <version>4.8.0-SNAPSHOT</version>
+    <relativePath>../../tests-pom/</relativePath>
+  </parent>
+  <groupId>org.eclipse.equinox</groupId>
+  <artifactId>org.eclipse.equinox.preferences.tests</artifactId>
+  <version>3.7.100-SNAPSHOT</version>
+  <packaging>eclipse-test-plugin</packaging>
+</project>
diff --git a/bundles/org.eclipse.equinox.preferences.tests/src/org/eclipse/equinox/preferences/tests/EclipsePreferencesTest.java b/bundles/org.eclipse.equinox.preferences.tests/src/org/eclipse/equinox/preferences/tests/EclipsePreferencesTest.java
new file mode 100644
index 000000000..accbd2dcb
--- /dev/null
+++ b/bundles/org.eclipse.equinox.preferences.tests/src/org/eclipse/equinox/preferences/tests/EclipsePreferencesTest.java
@@ -0,0 +1,142 @@
+/*******************************************************************************
+ * Copyright (c) 2018 InterSystems Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     InterSystems Corporation - tests for Bug 444188
+ *******************************************************************************/
+package org.eclipse.equinox.preferences.tests;
+
+import static org.junit.Assert.assertNotNull;
+
+import java.util.concurrent.CountDownLatch;
+
+import org.eclipse.core.runtime.CoreException;
+import org.eclipse.core.runtime.ICoreRunnable;
+import org.eclipse.core.runtime.IProgressMonitor;
+import org.eclipse.core.runtime.IStatus;
+import org.eclipse.core.runtime.NullProgressMonitor;
+import org.eclipse.core.runtime.Platform;
+import org.eclipse.core.runtime.Status;
+import org.eclipse.core.runtime.jobs.Job;
+import org.eclipse.core.runtime.preferences.IEclipsePreferences;
+import org.eclipse.core.runtime.preferences.IEclipsePreferences.INodeChangeListener;
+import org.eclipse.core.runtime.preferences.IEclipsePreferences.IPreferenceChangeListener;
+import org.eclipse.core.runtime.preferences.IEclipsePreferences.NodeChangeEvent;
+import org.eclipse.core.runtime.preferences.IEclipsePreferences.PreferenceChangeEvent;
+import org.junit.After;
+import org.junit.Test;
+import org.osgi.service.prefs.BackingStoreException;
+import org.osgi.service.prefs.Preferences;
+
+/**
+ * Test suite for class org.eclipse.core.internal.preferences.EclipsePreferences
+ * WARNING: many tests are still located in org.eclipse.core.tests.internal.preferences.EclipsePreferencesTest from eclipse.platform.runtime
+ */
+public class EclipsePreferencesTest {
+
+	/** 
+	 * Concurrent access to listener collection should not lead to exceptions
+	 * @see https://bugs.eclipse.org/bugs/show_bug.cgi?id=444188
+	 */
+	@Test
+	public void testConcurrentPreferenceChangeListener() throws InterruptedException, CoreException {
+		final IEclipsePreferences node = createTestNode();
+		final int runSize = 100000;
+		
+		executeInTwoThreads(new ICoreRunnable() {
+			@Override
+			public void run(IProgressMonitor monitor) throws CoreException {
+				IPreferenceChangeListener listener = new IPreferenceChangeListener() {
+					@Override
+					public void preferenceChange(PreferenceChangeEvent event) {
+					}
+				};
+				for (int i = 0; i < runSize && !monitor.isCanceled(); i++) {
+					node.addPreferenceChangeListener(listener); // Should not throw
+					node.put("x", "y"); // Should not throw
+					node.remove("x"); // Should not throw
+					node.removePreferenceChangeListener(listener); // Should not throw
+				}
+			}
+		});
+	}
+
+	/** 
+	 * Concurrent access to listener collection should not lead to exceptions
+	 * @see https://bugs.eclipse.org/bugs/show_bug.cgi?id=444188
+	 */
+	@Test
+	public void testConcurrentNodeChangeListener() throws InterruptedException, CoreException {
+		final IEclipsePreferences node = createTestNode();
+		final int runSize = 100000;
+		executeInTwoThreads(new ICoreRunnable() {
+			@Override
+			public void run(IProgressMonitor monitor) throws CoreException {
+				INodeChangeListener listener = new INodeChangeListener() {
+
+					@Override
+					public void removed(NodeChangeEvent event) {
+					}
+
+					@Override
+					public void added(NodeChangeEvent event) {
+					}
+				};
+				for (int i = 0; i < runSize && !monitor.isCanceled(); i++) {
+					node.addNodeChangeListener(listener); // Should not throw
+					try {
+						node.node(Thread.currentThread().getName()).removeNode(); // Should not throw
+					} catch (BackingStoreException e) {
+						throw new CoreException(new Status(IStatus.ERROR, "org.eclipse.core.tests.runtime", 0, "", null));
+					}
+					node.removeNodeChangeListener(listener); // Should not throw
+				}
+			}
+		});
+	}
+
+	private static void executeInTwoThreads(final ICoreRunnable runnable) throws InterruptedException, CoreException {
+		final CountDownLatch latch = new CountDownLatch(1);
+		Job job = Job.create("", new ICoreRunnable() {
+			@Override
+			public void run(IProgressMonitor monitor) throws CoreException {
+				latch.countDown();
+				runnable.run(monitor);
+			}
+		});
+		job.schedule();
+		try {
+			latch.await();
+				runnable.run(new NullProgressMonitor());
+		} finally {
+			job.cancel();
+			job.join();
+			IStatus result = job.getResult();
+			assertNotNull("Job is expected to complete", result);
+			if (!result.isOK()) {
+				throw new CoreException(result);
+			}
+		}
+	}
+	
+	@After
+	public void after() throws BackingStoreException {
+		getScopeRoot().removeNode();
+	}
+	
+	private static String getUniqueString() {
+		return System.currentTimeMillis() + "-" + Math.random();
+	}
+
+	private static IEclipsePreferences createTestNode() {
+		return (IEclipsePreferences) getScopeRoot().node(getUniqueString());
+	}
+	
+	private static IEclipsePreferences getScopeRoot() {
+		return (IEclipsePreferences) Platform.getPreferencesService().getRootNode().node("EclipsePreferencesTest");
+	}
+}
diff --git a/bundles/org.eclipse.equinox.preferences/src/org/eclipse/core/internal/preferences/EclipsePreferences.java b/bundles/org.eclipse.equinox.preferences/src/org/eclipse/core/internal/preferences/EclipsePreferences.java
index b3a90e1bd..ac1e70bb1 100644
--- a/bundles/org.eclipse.equinox.preferences/src/org/eclipse/core/internal/preferences/EclipsePreferences.java
+++ b/bundles/org.eclipse.equinox.preferences/src/org/eclipse/core/internal/preferences/EclipsePreferences.java
@@ -9,6 +9,7 @@
  *     IBM Corporation - initial API and implementation
  *     Julian Chen - fix for bug #92572, jclRM
  *     Jan-Ove Weichel (janove.weichel@vogella.com) - bug 474359
+ *     InterSystems Corporation - bug 444188
  *******************************************************************************/
 package org.eclipse.core.internal.preferences;
 
@@ -61,8 +62,8 @@ public class EclipsePreferences implements IEclipsePreferences, IScope {
 	// the parent of an EclipsePreference node is always an EclipsePreference node. (or null)
 	protected final EclipsePreferences parent;
 	protected boolean removed = false;
-	private ListenerList<INodeChangeListener> nodeChangeListeners;
-	private ListenerList<IPreferenceChangeListener> preferenceChangeListeners;
+	private final ListenerList<INodeChangeListener> nodeChangeListeners = new ListenerList<>();
+	private final ListenerList<IPreferenceChangeListener> preferenceChangeListeners = new ListenerList<>();
 	private ScopeDescriptor descriptor;
 
 	public static boolean DEBUG_PREFERENCE_GENERAL = false;
@@ -130,8 +131,6 @@ public class EclipsePreferences implements IEclipsePreferences, IScope {
 	@Override
 	public void addNodeChangeListener(INodeChangeListener listener) {
 		checkRemoved();
-		if (nodeChangeListeners == null)
-			nodeChangeListeners = new ListenerList<>();
 		nodeChangeListeners.add(listener);
 		if (DEBUG_PREFERENCE_GENERAL)
 			PrefsMessages.message("Added preference node change listener: " + listener + " to: " + absolutePath()); //$NON-NLS-1$ //$NON-NLS-2$
@@ -141,8 +140,6 @@ public class EclipsePreferences implements IEclipsePreferences, IScope {
 	@Override
 	public void addPreferenceChangeListener(IPreferenceChangeListener listener) {
 		checkRemoved();
-		if (preferenceChangeListeners == null)
-			preferenceChangeListeners = new ListenerList<>();
 		preferenceChangeListeners.add(listener);
 		if (DEBUG_PREFERENCE_GENERAL)
 			PrefsMessages.message("Added preference property change listener: " + listener + " to: " + absolutePath()); //$NON-NLS-1$ //$NON-NLS-2$
@@ -1021,8 +1018,6 @@ public class EclipsePreferences implements IEclipsePreferences, IScope {
 		if (nodeChangeListeners == null)
 			return;
 		nodeChangeListeners.remove(listener);
-		if (nodeChangeListeners.size() == 0)
-			nodeChangeListeners = null;
 		if (DEBUG_PREFERENCE_GENERAL)
 			PrefsMessages.message("Removed preference node change listener: " + listener + " from: " + absolutePath()); //$NON-NLS-1$ //$NON-NLS-2$
 	}
@@ -1034,8 +1029,6 @@ public class EclipsePreferences implements IEclipsePreferences, IScope {
 		if (preferenceChangeListeners == null)
 			return;
 		preferenceChangeListeners.remove(listener);
-		if (preferenceChangeListeners.size() == 0)
-			preferenceChangeListeners = null;
 		if (DEBUG_PREFERENCE_GENERAL)
 			PrefsMessages.message("Removed preference property change listener: " + listener + " from: " + absolutePath()); //$NON-NLS-1$ //$NON-NLS-2$
 	}
diff --git a/pom.xml b/pom.xml
index 2660a0cdb..bfd298beb 100644
--- a/pom.xml
+++ b/pom.xml
@@ -77,6 +77,7 @@
 -->
 
     <module>bundles/org.eclipse.equinox.ds.tests</module>
+    <module>bundles/org.eclipse.equinox.preferences.tests</module>
 <!-- removed until the dependency on aspectj is removed. see bug 470000
     <module>bundles/org.eclipse.equinox.region.tests</module>
 -->