James Oswald created GROOVY-7535:
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Summary: Groovy category support is broken again when using
multiple threads
Key: GROOVY-7535
URL: https://issues.apache.org/jira/browse/GROOVY-7535
Project: Groovy
Issue Type: Bug
Affects Versions: 2.4.4, 2.3.11
Environment: I have been able to reproduce this issue on a Cent O/S
version 6.4 with Java 64 Bit JDK 1.8 and groovy 2.4.4.
Reporter: James Oswald
When using groovy use block, we randomly get
groovy.lang.MissingPropertyException when trying to access a property off a
category,
{quote}
index 76
Exception in thread "Thread-77" groovy.lang.MissingPropertyException: No such
property: millisecond for class: java.lang.Integer
at
org.codehaus.groovy.runtime.ScriptBytecodeAdapter.unwrap(ScriptBytecodeAdapter.java:51)
at
org.codehaus.groovy.runtime.callsite.PojoMetaClassGetPropertySite.callGetProperty(PojoMetaClassGetPropertySite.java:43)
at
TimeCategoryTest$__spock_initializeFields_closure1$_closure4$_closure5.doCall(TimeCategoryTest.groovy:23)
at
TimeCategoryTest$__spock_initializeFields_closure1$_closure4$_closure5.doCall(TimeCategoryTest.groovy)
at sun.reflect.GeneratedMethodAccessor12.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at
org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:90)
at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:324)
at
org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:292)
at
groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1016)
at groovy.lang.Closure.call(Closure.java:423)
at groovy.lang.Closure.call(Closure.java:417)
at
org.codehaus.groovy.runtime.GroovyCategorySupport$ThreadCategoryInfo.use(GroovyCategorySupport.java:109)
at
org.codehaus.groovy.runtime.GroovyCategorySupport$ThreadCategoryInfo.access$400(GroovyCategorySupport.java:65)
at
org.codehaus.groovy.runtime.GroovyCategorySupport.use(GroovyCategorySupport.java:249)
at
org.codehaus.groovy.runtime.DefaultGroovyMethods.use(DefaultGroovyMethods.java:403)
{quote}
or groovy.lang.MissingMethodException when trying to access a method from a
category.
{quote}
index 82
Exception in thread "Thread-207" groovy.lang.MissingMethodException: No
signature of method: java.lang.String.test() is applicable for argument types:
(java.lang.String) values: [ bar]
Possible solutions: next(), toSet(), getAt(java.lang.String), wait(). trim(),
toList()
at
org.codehaus.groovy.runtime.ScriptBytecodeAdapter.unwrap(ScriptBytecodeAdapter.java:56)
at
org.codehaus.groovy.runtime.callsite.PojoMetaClassSite.call(PojoMetaClassSite.java:46)
at
org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:122)
at
CategoryTest$__spock_initializeFields_closure1$_closure5.doCall(CategoryTest.groovy:24)
at
CategoryTest$__spock_initializeFields_closure1$_closure5.doCall(CategoryTest.groovy)
at sun.reflect.GeneratedMethodAccessor12.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at
org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:90)
at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:324)
at
org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:292)
at
groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1016)
at groovy.lang.Closure.call(Closure.java:423)
at groovy.lang.Closure.call(Closure.java:417)
at
org.codehaus.groovy.runtime.GroovyCategorySupport$ThreadCategoryInfo.use(GroovyCategorySupport.java:109)
at
org.codehaus.groovy.runtime.GroovyCategorySupport$ThreadCategoryInfo.access$400(GroovyCategorySupport.java:65)
at
org.codehaus.groovy.runtime.GroovyCategorySupport.use(GroovyCategorySupport.java:249)
at
org.codehaus.groovy.runtime.DefaultGroovyMethods.use(DefaultGroovyMethods.java:403)
{quote}
On our production server, this causes either one of these exceptions to appear
every few days or weeks.
The same test in issue GROOVY-2105 causes the problem on Linux again. I double
checked the fix that was implemented for this ticket, and the fix (adding
synchronized to 3 methods) was removed in a later refactor of
GroovyCategorySupport.
I will attach 3 test cases that reproduce the threading issue. Do not the
problem does not happen 100% of the time, so playing with the number of threads
maybe needed.
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