https://issues.apache.org/bugzilla/show_bug.cgi?id=54380
Bug ID: 54380
Summary: In MapperListener.lifecycleEvent(..): check state of
parent before calling registerWrapper()
Product: Tomcat 7
Version: 7.0.34
Hardware: PC
OS: Windows XP
Status: NEW
Severity: minor
Priority: P2
Component: Catalina
Assignee: [email protected]
Reporter: [email protected]
Classification: Unclassified
In r1429745 I added a test to trunk that test what happens if the first attempt
to start a Context fails, the cause of the failure is removed, and then the
context is started for the second time.
The test is TestStandardContext.testBug46243().
It runs successfully, but the following message is logged:
Jan 07, 2013 3:02:07 PM org.apache.catalina.mapper.Mapper addWrapper
SEVERE: No context found:
This happens when the context is started for the second time. If I put a
breakpoint on the line that logs the message, the stack trace is (running
Tomcat trunk):
Mapper.addWrapper(String, String, String, String, Wrapper, boolean, boolean)
line: 319
MapperListener.registerWrapper(Wrapper) line: 417
MapperListener.lifecycleEvent(LifecycleEvent) line: 433
LifecycleSupport.fireLifecycleEvent(String, Object) line: 119
Tomcat$ExistingStandardWrapper(LifecycleBase).fireLifecycleEvent(String,
Object) line: 90
Tomcat$ExistingStandardWrapper(LifecycleBase).setStateInternal(LifecycleState,
Object, boolean) line: 402
Tomcat$ExistingStandardWrapper(LifecycleBase).start() line: 168
StandardContext.startInternal() line: 5009
StandardContext(LifecycleBase).start() line: 150
TestStandardContext.testBug46243() line: 109
================================================
My understanding is the following:
1. When Tomcat starts, registration into the mapper is performed by
StandardService.startInternal().
Stack trace:
Mapper.addHost(String, String[], Host) line: 89
MapperListener.registerHost(Host) line: 287
MapperListener.startInternal() line: 107
MapperListener(LifecycleBase).start() line: 150
StandardService.startInternal() line: 450
StandardService(LifecycleBase).start() line: 150
StandardServer.startInternal() line: 745
StandardServer(LifecycleBase).start() line: 150
TomcatBaseTest$TomcatWithFastSessionIDs(Tomcat).start() line: 326
TomcatBaseTest$TomcatWithFastSessionIDs.start() line: 421
TestStandardContext.testBug46243() line: 89
2. The Context that failed to start is skipped by
MapperListener.registerHost(), thanks to getState().isAvailable() check there.
3. The Mapper.addWrapper() call (the one that prints that "No context found"
message) happens when AFTER_START_EVENT is processed for the Wrapper. At this
moment the StandardContext.startInternal() has not completed yet and thus the
context has not been registered by the mapper.
4. Nothing serious happens, besides the message, because when
StandardContext.startInternal() completes, the AFTER_START_EVENT for the
Context is processed. This is when the Context and the Wrappers that it
contains are registered.
Thus I think there should be a check either in MapperListener.lifecycleEvent()
or in MapperListener.registerWrapper() that tests whether
getContainer().getState().isAvailable() is true.
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