https://bz.apache.org/bugzilla/show_bug.cgi?id=61930
Bug ID: 61930
Summary: Classloader seems went wrong
Product: Tomcat 9
Version: 9.0.2
Hardware: PC
Status: NEW
Severity: normal
Priority: P2
Component: Catalina
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: -----
When I migrated my app from tomcat 7 to 9, I got stuck in a very strange
NoSuchMethodException since no code and dependencies had been changed.
After debugging, the exception can be reproduced like this:
// class in spring-context-support-4.3.10.RELEASE, no proxy or reflection
org.springframework.cache.ehcache.EhCacheManagerFactoryBean bean = new
EhCacheManagerFactoryBean();
// true aboviously
System.out.println(bean instanceof EhCacheManagerFactoryBean);
// true because EhCacheManagerFactoryBean implements FactoryBean
System.out.println(bean instance of FactoryBean);
// return null, expectedly
((FactoryBean) bean).getObject();
// Exception happend: java.lang.NoSuchMethodError:
org.springframework.cache.ehcache.EhCacheManagerFactoryBean.getObject()Lnet/sf/ehcache/CacheManager;
bean.getObject();
</code>
In this example, I cannot invoke method of class instance, but can invoke after
meaningless casting. So I guess there may be something wrong with ClassLoader.
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