Fix NPE while opening CompareView for oldest commit

We were here to strongly relay on JGti API and it caching. According to
Shawn's mail[1] JGit disposes commit body when we 'thinks' that it isn't
usable any more. Therefore we should always re-parse RevCommit objects
before we want to obtain data from them.

[1] http://dev.eclipse.org/mhonarc/lists/jgit-dev/msg00566.html

Bug: 322732
Change-Id: I6691e4c7085434de28ec81c4634ce341662b3433
Signed-off-by: Dariusz Luksza <dariusz@luksza.org>
Signed-off-by: Chris Aniszczyk <caniszczyk@gmail.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/org.eclipse.egit.core/src/org/eclipse/egit/core/internal/storage/CommitFileRevision.java b/org.eclipse.egit.core/src/org/eclipse/egit/core/internal/storage/CommitFileRevision.java
index 88d0e2fb93..df519a7ef1 100644
--- a/org.eclipse.egit.core/src/org/eclipse/egit/core/internal/storage/CommitFileRevision.java
+++ b/org.eclipse.egit.core/src/org/eclipse/egit/core/internal/storage/CommitFileRevision.java
@@ -26,6 +26,7 @@ import org.eclipse.jgit.lib.PersonIdent;
 import org.eclipse.jgit.lib.Ref;
 import org.eclipse.jgit.lib.Repository;
 import org.eclipse.jgit.revwalk.RevCommit;
+import org.eclipse.jgit.revwalk.RevWalk;
 import org.eclipse.jgit.treewalk.TreeWalk;
 import org.eclipse.osgi.util.NLS;
 import org.eclipse.team.core.history.IFileRevision;
@@ -55,6 +56,11 @@ class CommitFileRevision extends GitFileRevision {
 			final String fileName, final ObjectId blob) {
 		super(fileName);
 		db = repo;
+		try {
+			new RevWalk(db).parseBody(rc);
+		} catch (IOException e) {
+			Activator.logError(e.getMessage(), e);
+		}
 		commit = rc;
 		author = rc.getAuthorIdent();
 		path = fileName;