Hi James,
thanks for reporting this. :)
Sadly I could not replicate the problem with groovy 2.4.5 (on windows)
and your testcase (tried different times and different amounts of threads).
I guess that's just caused by platform differences as I do not remember
any changes in 2.4.5 related to this problem and
https://github.com/apache/incubator-groovy/blob/d3bc07e5c2af7f5fbd344a961d549772de0680c7/src/main/org/codehaus/groovy/runtime/GroovyCategorySupport.java
looks like it could have concurrency issues.
- Pascal
Am 27.10.2015 um 23:10 schrieb James Oswald:
For the below email I have create a ticket and attached examples to
this ticket: https://issues.apache.org/jira/browse/GROOVY-7535
When using groovy use block, we randomly get
groovy.lang.MissingPropertyException when trying to access a property
off a category.
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$400(GroovyCategorySupport.java:65)
at
org.codehaus.groovy.runtime.GroovyCategorySupport.use(GroovyCategorySupport.java:249)
at
org.codehaus.groovy.runtime.DefaultGroovyMethods.use(DefaultGroovyMethods.java:403)
or groovy.lang.MissingMethodException when trying to access a method
from a category.
index 82
Exception in thread "Thread-207"
groovy.lang.MissingMethodException: No signature of method:
java.lang.String.test() is applicable for argument types:
(java.lang.String) values: [ bar]
Possible solutions: next(), toSet(), getAt(java.lang.String),
wait(). trim(), toList()
at
org.codehaus.groovy.runtime.ScriptBytecodeAdapter.unwrap(ScriptBytecodeAdapter.java:56)
at
org.codehaus.groovy.runtime.callsite.PojoMetaClassSite.call(PojoMetaClassSite.java:46)
at
org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:122)
at
CategoryTest$__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)
On the server, either one of these exceptions to appear every few days
or weeks.
The code below will reproduce this error:
class TestCategory {
def static String test(String self, String foo) {
return self + foo
}
}
def test = {
100.times {
sleep( 10 )
use(TestCategory) {
println "foo".test(' bar')
}
sleep( 20 )
}
}
100.times {
Thread.start test
}
I found a similar issue GROOVY-2105
<https://issues.apache.org/jira/browse/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.
NOTE: problem does not happen 100% of the time. 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.
I have reproduced these exceptions on Cent O/S version 6.4 with 64 Bit
JDK 1.8 and groovy 2.4.4
--
James
