OpenGrok 历史记录缓存空 ptr 异常

Question

索引时，它会尝试为 perforce 存储库创建历史记录缓存，并失败并出现以下 NULL ptr 异常：

2015-01-16 10:30:32.178-0800 INFO t1 HistoryGuru.createCacheReal: Creating historycache for 1 repositories
2015-01-16 10:30:32.179-0800 INFO t22 HistoryGuru.createCache: Creating historycache for /local2/mnt/workspace/opengrok/src (PerforceRepository)
2015-01-16 10:30:32.181-0800 FINE t22 Executor.exec: Executing command [/pkg/qct/software/p4/p4, dirs, *] in directory /local2/mnt/workspace/opengrok/src
2015-01-16 10:30:32.458-0800 FINE t22 Executor.exec: Finished command [/pkg/qct/software/p4/p4, dirs, *] in directory /local2/mnt/workspace/opengrok/src
2015-01-16 10:30:32.459-0800 FINE t22 Executor.exec: Executing command [p4, changes, -t, ...] in directory /local2/mnt/workspace/opengrok/src
2015-01-16 10:30:39.230-0800 FINE t22 Executor.exec: Finished command [p4, changes, -t, ...] in directory /local2/mnt/workspace/opengrok/src
2015-01-16 10:30:39.366-0800 FINE t22 FileHistoryCache.store: Storing history for repo /local2/mnt/workspace/opengrok/src
2015-01-16 10:30:39.369-0800 WARNING t22 FileHistoryCache.storeLatestCachedRevision: cannot write latest cached revision to file: null
2015-01-16 10:30:39.369-0800 WARNING t22 HistoryGuru.createCache: An error occured while creating cache for /local2/mnt/workspace/opengrok/src (PerforceRepository)
java.lang.NullPointerException
    at org.opensolaris.opengrok.history.FileHistoryCache.storeLatestCachedRevision(FileHistoryCache.java:595

我已经检查了用户对$OPENGROK_INSTANCE_BASE/data的写入权限。有什么想法要检查或可能发生了什么？

开放格罗克版本：0.12.1.1索引 cmd：

OPENGROK_TAG=1 OPENGROK_VERBOSE=1 OPENGROK_REMOTE_REPOS_OFF=0 OPENGROK_TOMCAT_CASE=/usr/share/tomcat7 OPENGROK_INSTANCE_BASE=/local2/mnt/workspace/opengrok ./OpenGrok index /local2/mnt/workspace/opengrok/src/

Answer 1

事实证明，

这是OpenGrok中的一个错误。请参阅线程：https://github.com/OpenGrok/OpenGrok/issues/878

简而言之，src/org/opensolaris/opengrok/history/FileHistoryCache.java 需要一个 NULL ptr 检查。

 @@ -592,7 +592,9 @@ private void storeLatestCachedRevision(Repository repository, String rev) {
                 ex.getCause());
         } finally {
            try {
-               writer.close();
+               if (writer != null) {
+                   writer.close();
+               }
            } catch (IOException ex) {
                logger.log(Level.INFO, "cannot close file: " + ex);
            }

https://github.com/OpenGrok/OpenGrok/commit/0dbb0e366b3798ac18d1bfc010a1985bce75f071

为什么文件编写器首先是 NULL 是另一个问题......