COM4J.loadNativeLibrary() fails with ExceptionInInitializerError when com4j JAR is on UNC path

[martian111]

When the com4j.jar file is located on an UNC path (for example: \host\share\foo\lib\com4j-20120426-2.jar), it will cause an ExceptionInInitializerError with root cause:
Caused by: java.lang.NullPointerException
at com4j.COM4J.loadNativeLibrary(COM4J.java:567)
at com4j.COM4J.(COM4J.java:522)
... 7 more

First the NPE is caused by using LOGGER before it's initialized (since both are part of the class's static init code and the LOGGER part is a the end) in the IOException catch block. The real root cause is a bug in the file path parsing code, causing the process that copies the DLL file to the filesystem to throw an IOException.

Found that if the COM4J.class URL is:

jar:file://host/share/foo/lib/com4j-20120426-2.jar!/com4j/COM4J.class

The dllFile will be:

\host\share\foo\lib\com4j-x86.dll

which is invalid. It should be:

\\host\share\foo\lib\com4j-x86.dll

[kohsuke]

Solved by the pull request.