src/main/java/ognl/OgnlRuntime.java
public static void clearCache()
    {
        _methodParameterTypesCache.clear();
        _ctorParameterTypesCache.clear();
        _propertyDescriptorCache.clear();
        _constructorCache.clear();
        _staticMethodCache.clear();
        _instanceMethodCache.clear();
        _invokePermissionCache.clear();
        _fieldCache.clear();
        _superclasses.clear();
        _declaredMethods[0].clear();
        _declaredMethods[1].clear();
        _methodAccessCache.clear();
        _methodPermCache.clear();
    }
public static void clearCache()
    {
        _methodParameterTypesCache.clear();
        _ctorParameterTypesCache.clear();
        _propertyDescriptorCache.clear();
        _constructorCache.clear();
        _staticMethodCache.clear();
        _instanceMethodCache.clear();
        _invokePermissionCache.clear();
        _fieldCache.clear();
        _superclasses.clear();
        _declaredMethods[0].clear();
        _declaredMethods[1].clear();
        _methodAccessCache.clear();
        _methodPermCache.clear();
    }
Clears all of the cached reflection information normally used
to improve the speed of expressions that operate on the same classes
or are executed multiple times.

<p>
<strong>Warning:</strong> Calling this too often can be a huge performance
drain on your expressions - use with care.
</p>