Gerwin created DAEMON-398:
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Summary: Java 11 jvm.dll startup error messages not available on
stdout/stderr
Key: DAEMON-398
URL: https://issues.apache.org/jira/browse/DAEMON-398
Project: Commons Daemon
Issue Type: Bug
Components: Procrun
Affects Versions: 1.1.1
Environment: Windows
Reporter: Gerwin
Attachments: set-stdout.patch
*Steps to reproduce*
# Install Java 11
# Install prunsrv.exe using jvm.dll and specify stdout and stderr file.
# Using prunmgr, add a Java Option '-invalid'
# Start the service
# stdout and stderr files are empty!
# Install Java 10
# Using prunmgr, switch the Java Virtual Machine to Java 10
# Start the service
# {code:none|title=stderr}
Java HotSpot(TM) 64-Bit Server VM warning: Ignoring option MaxPermSize; support
was removed in 8.0
Unrecognized option: -invalid
{code}
*Analysis*
* It works for Java 8, 9 and 10, fails for 11, 12 and 13-ea.
* I followed this guide: [Redirecting standard I/O from within a
program|https://jdebp.eu/FGA/redirecting-standard-io.html] (see
[^set-stdout.patch]), but it didn't help.
* Even when I compile prunsrv with Visual Studio 2017 15.9 (linker 14.16) and
test with Java 13-ea, which is also compiled with the same version (hence using
the same C-runtime library) it does not work.
* The guide ends with what the probably causing the issue:
{quote}
... the one problem that remains with redirecting Win32 file handles:
It doesn't affect anything in the program using a different C runtime library
(such as a third-party DLL, for example).
{quote}
* Setting registry value Log/LogJniMessages=1, which is using the {{vfprintf}}
option of the
[JNI_CreateJavaVM|https://docs.oracle.com/en/java/javase/11/docs/specs/jni/invocation.html#jni_createjavavm]
does not help. Maybe because is is added after the user-specified Java Options?
*Ideas*
# Make {{vfprintf}} the first parameter
Downside of {{vfprintf}} is that it is hard to distinct between stdout and
stderr. Maybe make a JNI call to {{System.out}} and {{System.err}} to be able
to recognize the {{*File}} pointer and map to stdout and stderr accordingly.
And I think that {{javajni.c/apxJavaSetOut()}} should not be required.
# Log a bug for OpenJDK and try to get it fixed.
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