OpenJ9 fails to start if the classpath exactly matches the main class name

[paulcheeseman]

The OpenJ9 JVM fails to start, with IBM Java 8 or any version of IBM Semeru, if the classpath is set to the same string value as the main class name.

For example:

$ java -cp Main Main
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.

It doesn't matter whether the classpath is set on the command line as above, or via the CLASSPATH environment variable.

Using -verbose:init and _JAVA_LAUNCHER_DEBUG=true I narrowed the failure down to somewhere in JNI_CreateJavaVM() before this line:

openj9/runtime/j9vm/jvm.c

Line 2228 in 7dece2b

|| (0 != addLauncherArgs(&j9portLibrary, args, launcherArgumentsSize, &vmArgumentsList,

(The debug string "Adding command line arguments" does not get printed in the failing scenario.)

Other JVM implementations (e.g. Hotspot) do not exhibit this issue.

[pshipton]

It's related to the following check in initialArgumentScan()

	if ((NULL != classPathValue) && (NULL != javaCommandValue) && (strcmp(javaCommandValue, classPathValue) == 0)) {
		specialArgs->executableJarPath = javaCommandValue;
	}

when addJarArguments() is called, it's not a valid jar, a non-zero status is returned and the JVM fails to start.