Problem in Debug mode only, works in Run mode!

[Daniel Moussa]

If I start my WAS 5.1 in debug mode I get crazy pile of exceptions during the startup. I have a Struts 1 project that runs inside an EAR project on WAS 5.1.
Starting WAS in Run mode works fine, problem only in Debug mode.
The Struts project also used Spring and Hibernate.

The console throws all sorts of errors mainly related to class-loader confusion that I cannot list all here, but here is a glimpse of my nightmare with WAS 5.1:
The following console error gets thrown hundred times.

Error while defining class:[myClass]
This error indicates that the class: <unknown>  <
could not be located while defining the class: [myClass]
This is often caused by having the class at a higher point in the classloader hierarchy
com.ibm.ws.classloader.CompoundClassLoader@42534253
   Local ClassPath:[some very long class path ]
   Delegation Mode: PARENT_FIRST
   [1] com.ibm.ws.classloader.JarClassLoader@443751027 Local Classpath:[some local jar]Delegation mode: PARENT_FIRST
   [2] 
com.ibm.ws.classloader.ExtJarClassLoader@17cd17cd
   Local ClassPath: D:\WID\runtimes\base_v51\lib\app
   Delegation Mode: PARENT_LAST
   [3] com.ibm.ws.classloader.ProtectionClassLoader@79de79de
   [4] com.ibm.ws.bootstrap.ExtClassLoader@578f578f
   [5] sun.misc.Launcher$AppClassLoader@1ecf1ecf
   [6] sun.misc.Launcher$ExtClassLoader@273c273c
---Original exception---
java.lang.NoClassDefFoundError
	at java.lang.Throwable.<init>(Throwable.java)
	at java.lang.Throwable.<init>(Throwable.java)
        ...

after hundred times of this error it throws this exception saying it cannot load the Servlet. Aparantly the Servlet crashed during init:

[16/05/11 16:59:01:718 NZST] 4c1d4c1d ServletInstan E SRVE0100E: Did not realize  init() exception thrown by servlet action: javax.servlet.UnavailableException
	at java.lang.Throwable.<init>(Throwable.java)
	at java.lang.Throwable.<init>(Throwable.java)

If this sounds familiar, please help!
This only happens in Debug mode, Run mode is manageable:banghead:

Thanks to all..
Daniel

[Mikalai Zaikin]

Please, try to switch WAS classloader to PARENT_LAST mode: this will give your application's classloader higher priority.

Read more here and here.

HTH,
MZ

[Daniel Moussa]

Many thanks Mikalai (well done on the SCEA Study Guide ),
I tried that with different "WAR classloader Policy" modes (Module/Application). The crashes are gone, but so as the application which fails to start.

Class Loader Setup:
for [my EAR App]
Classloader mode: PARENT_LAST
WAR Class Loader Policy: APPLICATION
Start weight: 10

For [my Web module]
Classloader mode: PARENT_LAST
Start weight: 10000

There is that fine tuning mystery which I don't know yet!
See console below:

[17/05/11 09:01:11:031 NZST] 4e194e19 ApplicationMg A WSVR0221I: Application started: IBMUTC
[17/05/11 09:01:11:031 NZST] 4e194e19 ApplicationMg A WSVR0200I: Starting application: [my EAR app]
[17/05/11 09:01:12:046 NZST] 4e194e19 WebContainer  A SRVE0169I: Loading Web Module: [my Web module].
[17/05/11 09:01:12:515 NZST] 4e194e19 SystemErr     R 
[17/05/11 09:01:13:171 NZST] 4e194e19 WebApp        E SRVE0015E: Failure to initialize Web application [my Web module]
[17/05/11 09:01:13:296 NZST] 4e194e19 WebGroup      E SRVE0054E: An error occurred while loading Web application
[17/05/11 09:01:13:328 NZST] 4e194e19 DeployedAppli W WSVR0206E: Module, [my Web module].war, of application, [my EAR app].ear/deployments/[my Web module], failed to start
[17/05/11 09:01:13:328 NZST] 4e194e19 ApplicationMg W WSVR0101W: An error occurred starting, [my EAR app]
[17/05/11 09:01:13:328 NZST] 4e194e19 ApplicationMg A WSVR0217I: Stopping application: [my EAR app]
[17/05/11 09:01:13:343 NZST] 4e194e19 ApplicationMg A WSVR0220I: Application stopped: [my EAR app]
[17/05/11 09:01:13:484 NZST] 4e194e19 HttpTransport A SRVE0171I: Transport http is listening on port 9,082.
[17/05/11 09:01:15:421 NZST] 4e194e19 HttpTransport A SRVE0171I: Transport https is listening on port 9,444.
[17/05/11 09:01:15:437 NZST] 4e194e19 HttpTransport A SRVE0171I: Transport http is listening on port 9,091.
[17/05/11 09:01:15:468 NZST] 4e194e19 HttpTransport A SRVE0171I: Transport https is listening on port 9,044.
[17/05/11 09:01:15:484 NZST] 4e194e19 RMIConnectorC A ADMC0026I: RMI Connector available at port 28091
[17/05/11 09:01:15:500 NZST] 4e194e19 WsServer      A WSVR0001I: Server server1 open for e-business

back to my wall

[Mikalai Zaikin]

Hi,

It's not possible to tell exactly why it failed to start - too few info in logs.

Quick question: do you have WAR file name with spaces ? Good practice is to give EAR/WAR names without spaces (as well as deploy EARs to folders without spaces)

Regards,
MZ

[Daniel Moussa]

Hi,
No spaces in my EAR and WEB (I just replaced the real names with aliases, sorry if that confused).

Thanks,

Daniel