gubiao created WW-5195:
--------------------------
Summary: Dispatcher: Infinite loop with dispatcher FORWARD
Key: WW-5195
URL: https://issues.apache.org/jira/browse/WW-5195
Project: Struts 2
Issue Type: Bug
Components: Core, Core Actions
Affects Versions: 6.0.0
Reporter: gubiao
*Action a:*
public String a() {
request.getRequestDispatcher("/b.action").forward(request, response);
return null;
}
*Action b:*
public String b() {
...
}
When the user calls /a.action, it is automatically forwarded to b.action. These
codes work well in Struts 2.5.x version.
After upgrading to the 6.0.0 version, code like the above will cause an
infinite loop issue.
In Struts 6.0.0, code like "actionA->forward->actionB" will cause infinite loop
issue.
This issue also exists when using ServletDispatcherResult to initiate a forward
request:
<result name="success" type="dispatcher">
<param name="location">b.action</param>
</result>
This issue related to [#179|https://github.com/apache/struts/pull/179] pull
request.
[https://github.com/apache/struts/pull/179/files#diff-a394bef2608163b6810c293626eb1356e3be43ec82f94fe6da881f0608a86547]
ActionInvocation invocation = ActionContext.getContext().getActionInvocation();
if (invocation == null || invocation.isExecuted()) { // *The code here doesn't
handle the servlet forward case*
proxy=getContainer().getInstance(ActionProxyFactory.class).createActionProxy(namespace,
name, method,
extraContext, true, false);
} else {
proxy=invocation.getProxy();
}
Once this problem occurs, the jvm process consumes a lot of CPU resources, and
there is no log to troubleshoot.
I don't know much about how Struts internals work, is there any workaround
other than delayed upgrade to Struts 6.x version?
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