Thomas Mortagne created VELOCITY-924:
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Summary: Bad cache handling for java.lang.Class methods
Key: VELOCITY-924
URL: https://issues.apache.org/jira/browse/VELOCITY-924
Project: Velocity
Issue Type: Bug
Components: Engine
Affects Versions: 2.2
Reporter: Thomas Mortagne
Requirement:
A binding $var containing an object which class (org.xwiki.MyClass)
implementing a {{String getName()}} method.
The following code:
{code}
$var.class.getName()
$var.getName()
{code}
fail with:
{noformat}
Caused by: org.apache.velocity.exception.MethodInvocationException: Invocation
of method 'getName' in class org.xwiki.MyClass threw exception
java.lang.IllegalArgumentException: object is not an instance of declaring
class at mytemplaye[line 1, column 26]
at
org.apache.velocity.runtime.parser.node.ASTMethod.handleInvocationException(ASTMethod.java:306)
at
org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:239)
at
org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:369)
at
org.apache.velocity.runtime.parser.node.ASTReference.render(ASTReference.java:490)
at
org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:423)
at org.apache.velocity.Template.merge(Template.java:358)
at org.apache.velocity.Template.merge(Template.java:262)
at
org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVelocityEngine.java:271)
... 69 more
Caused by: java.lang.IllegalArgumentException: object is not an instance of
declaring class
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at
org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.doInvoke(UberspectImpl.java:565)
at
org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:548)
at
org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:219)
... 75 more
{noformat}
The reason is that ClassUtils.getMethod cache does not make any difference
between an instance of Class<org.xwiki.MyClass> and and instance of
org.xwiki.MyClass so when ASTMethod#execute ask for the second getName() it end
up with Class#getName() instead of MyClass#getName().
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