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https://issues.apache.org/jira/browse/GROOVY-7535?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jochen Kemnade updated GROOVY-7535:
-----------------------------------
    Attachment: locking.png

> Groovy category throwing MissingMethodException and MissingPropertyException 
> when using multiple threads
> --------------------------------------------------------------------------------------------------------
>
>                 Key: GROOVY-7535
>                 URL: https://issues.apache.org/jira/browse/GROOVY-7535
>             Project: Groovy
>          Issue Type: Bug
>    Affects Versions: 2.3.11, 2.4.4
>         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
>            Assignee: Pascal Schumacher
>             Fix For: 2.4.6
>
>         Attachments: 
> 0001-GROOVY-7535-fix-race-condition-between-the-modificat.patch, 
> CategoryTest.groovy, exceptionForCategoryTest.txt, 
> exceptionForTimeCategoryTest.txt, locking.png, Test.groovy, 
> TimeCategoryTest.groovy
>
>
> When using groovy use block, we randomly get 
> groovy.lang.MissingPropertyException when trying to access a property off a 
> category.  (Attached is an example)
> {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 the server, either one of these exceptions to appear every few days or 
> weeks.
> I found a similar issue GROOVY-2105 which contains a test that reproduces 
> this problem on Linux.  Looking back the fix that was implemented for this 
> ticket was to add synchronized to 3 methods.  These changes were late removed 
> in a refactor of GroovyCategorySupport.
> I have attached 3 test cases that reproduce the threading issue.  
> NOTE: problem does not happen 100% of the time as it is a threading and 
> timing issue, so you may have to play with the number of threads to generate 
> the exception.  What I have attached generates the exception on my linux box 
> most of the time.



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