Debugging via logging issue

[zcy240405539]

I was trying to add debugging feature and enable local logging for my opengrok project. I had eddited logging.properties file directly under opengrok work folder. And my indexer's first line as java -Djava.util.logging.config.file=/opengrok/logging.properties. The indexer was running well, but I did not see any logging file under my designated location. And my logging.properties file as below:

handlers= java.util.logging.FileHandler, java.util.logging.ConsoleHandler, java.util.logging.StreamHandler, java.util.logging.SocketHandler, java.util.logging.MemoryHandler
.level= ALL

java.util.logging.FileHandler.pattern = ~/log/FileHandler/opengrok%g.%u.log
java.util.logging.FileHandler.limit = 52428800
java.util.logging.FileHandler.count = 3
java.util.logging.FileHandler.level = ALL
java.util.logging.FileHandler.formatter = org.opengrok.indexer.logger.formatter.SimpleFileLogFormatter

java.util.logging.ConsoleHandler.pattern = ~/log/ConsoleHandler/opengrok%g.%u.log
java.util.logging.ConsoleHandler.level = ALL
java.util.logging.ConsoleHandler.formatter = org.opengrok.indexer.logger.formatter.SimpleConsoleFormatter

java.util.logging.StreamHandler.pattern = ~/log/StreamHandler/opengrok%g.%u.log
java.util.logging.StreamHandler.level = ALL
java.util.logging.StreamHandler.formatter = java.util.logging.SimpleFormatter

java.util.logging.SocketHandler.pattern = ~/log/SocketHandler/opengrok%g.%u.log
java.util.logging.SocketHandler.level = ALL
java.util.logging.SocketHandler.formatter = java.util.logging.SimpleFormatter

java.util.logging.MemoryHandler.pattern = ~/log/MemoryHandler/opengrok%g.%u.log
java.util.logging.MemoryHandler.level = ALL
java.util.logging.MemoryHandler.formatter = java.util.logging.SimpleFormatter

org.opengrok.level = ALL

[vladak]

This looks more of a stackoverflow.com question than OpenGrok one. Firstly, think about why do you need so many handlers and what should be the specifics of their setup. Second, reduce and focus on the handlers that are important. It looks like the FileHandler is the primary here.

If you run the indexer with such configuration, you will get:

Can't load log handler "java.util.logging.FileHandler"
java.nio.file.NoSuchFileException: ~/log/FileHandler/opengrok0.0.log.lck
java.nio.file.NoSuchFileException: ~/log/FileHandler/opengrok0.0.log.lck
	at java.base/sun.nio.fs.UnixException.translateToIOException(UnixException.java:92)
	at java.base/sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:111)
	at java.base/sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:116)
	at java.base/sun.nio.fs.UnixFileSystemProvider.newFileChannel(UnixFileSystemProvider.java:182)
	at java.base/java.nio.channels.FileChannel.open(FileChannel.java:292)
	at java.base/java.nio.channels.FileChannel.open(FileChannel.java:345)
	at java.logging/java.util.logging.FileHandler.openFiles(FileHandler.java:512)
	at java.logging/java.util.logging.FileHandler.<init>(FileHandler.java:279)
	at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:490)
	at java.base/java.lang.Class.newInstance(Class.java:584)
	at java.logging/java.util.logging.LogManager.createLoggerHandlers(LogManager.java:1000)
	at java.logging/java.util.logging.LogManager$4.run(LogManager.java:970)
	at java.logging/java.util.logging.LogManager$4.run(LogManager.java:966)
	at java.base/java.security.AccessController.doPrivileged(Native Method)
	at java.logging/java.util.logging.LogManager.loadLoggerHandlers(LogManager.java:966)
	at java.logging/java.util.logging.LogManager.initializeGlobalHandlers(LogManager.java:2417)
	at java.logging/java.util.logging.LogManager$RootLogger.accessCheckedHandlers(LogManager.java:2511)
	at java.logging/java.util.logging.Logger.getHandlers(Logger.java:2089)
	at java.logging/java.util.logging.Logger.log(Logger.java:976)
	at java.logging/java.util.logging.Logger.doLog(Logger.java:1006)
	at java.logging/java.util.logging.Logger.log(Logger.java:1029)
	at org.opengrok.indexer.util.Executor.registerErrorHandler(Executor.java:398)
	at org.opengrok.indexer.index.Indexer.main(Indexer.java:165)

Looking at the FileHandler documentation, it says this about the pattern parameter:

A pattern consists of a string that includes the following special components that will be replaced at runtime:

"/" the local pathname separator
"%t" the system temporary directory
"%h" the value of the "user.home" system property
"%g" the generation number to distinguish rotated logs
"%u" a unique number to resolve conflicts
"%%" translates to a single percent sign "%"

So, the ~ character will not do. Once absolute path is used (and the dirname created), a log file will be created underneath.

[zcy240405539]

I changed all logging path to [pattern = /workspace/opengrok/log/opengrok%g.%u.log], It is only logging when I run the indexer, and only the FileHandler is working. And it does not logging constantly, which it only log once when I run indexer. How to make it logging constantly while the Opengrok project running in Tomcat server?

[vladak]

Each JVM instance has its own logging setup. The indexer runs on a distinct JVM than the web application, so you need to configure logging for each separately. That said, they can theoretically share a common configuration, however that would probably be too confusing to follow. Anyhow, see https://github.com/oracle/opengrok/wiki/Debugging#debugging-via-logging