Static initialization in java 7 -


i have code initializes class as:

private static myclass myobj = new myclass();

and using myobj in code below. works fine if java 6 used. when use java 7, nullpointerexception thrown.

java.lang.nullpointerexception exception in thread "main" java.lang.exceptionininitializererror

as work around, put null check myobj before using , made work.

but still confused if there changes in java 7 implementation made static initialization fail?

edit : found similar issue faced openam.

we'll need more code sample , exception stacktrace diagnostic.

pure speculation, know in java 7, changed class initialization little bit

https://docs.oracle.com/javase/specs/jls/se7/html/jls-12.html#jls-12.4.2

for each class or interface c, there unique initialization lock lc. mapping c lc left discretion of java virtual machine implementation. procedure initializing c follows:

  1. synchronize on initialization lock, lc, c. involves waiting until current thread can acquire lc.

this different previous java class object used lock.

still, it's quite unlikely it's responsible case.


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