Can't include interfaces in a synchronized class
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Key: JRUBY-5168
URL: http://jira.codehaus.org/browse/JRUBY-5168
Project: JRuby
Issue Type: Bug
Reporter: Rib Rdb
Assignee: Thomas E Enebo
If you include a java interface after including JRuby::Synchronized, you get a
NPE:
{code}$ jruby -r java -r jruby/synchronized -e 'class A;include
JRuby::Synchronized;include java.lang.Iterable;end'
DynamicMethod.java:320:in `calculateProtectedClass':
java.lang.NullPointerException
from DynamicMethod.java:104:in `init'
from DynamicMethod.java:86:in `<init>'
from SynchronizedDynamicMethod.java:44:in `<init>'
from RubyModule.java:936:in `newCacheEntry'
from RubyModule.java:952:in `addToCache'
from RubyModule.java:894:in `searchWithCache'
from RubyModule.java:871:in `searchMethod'
from RubyModule.java:1278:in `isMethodBound'
from JavaInterfaceTemplate.java:130:in `initInterfaceImplMethods'
from JavaInterfaceTemplate.java:99:in `appendFeaturesToClass'
from JavaInterfaceTemplate.java:79:in `append_features'
from
org/jruby/java/proxies/JavaInterfaceTemplate$s_method_1_0$RUBYFRAMEDINVOKER$append_features.gen:65535:in
`call'
from JavaMethod.java:319:in `call'
from RubyClass.java:663:in `finvoke'
from RuntimeHelpers.java:452:in `invoke'
from RubyBasicObject.java:332:in `callMethod'
from RubyModule.java:1901:in `include'
from org/jruby/RubyModule$i_method_0_0$RUBYINVOKER$include.gen:65535:in
`call'
from JavaMethod.java:630:in `call'
from DynamicMethod.java:186:in `call'
from CachingCallSite.java:309:in `cacheAndCall'
from CachingCallSite.java:148:in `call'
from -e:1:in `class_0$RUBY$A'
from -e:1:in `__file__'
from -e:-1:in `load'
from Ruby.java:686:in `runScript'
from Ruby.java:569:in `runNormally'
from Ruby.java:415:in `runFromMain'
from Main.java:286:in `run'
from Main.java:128:in `run'
from Main.java:97:in `main'
{code}
A workaround is to include Synchronized after including the java interface.
However this means that once you include Synchronized you can't create a
subclass which includes a new interface.
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