OC4J Logging into Application.log

Hi someone,
i try to log into the Application.log configure in the orion-application.xml.
how can do this in Java?
Thanks to all for help
Matthias

After 10 Hours i find the solution ;-(
The Application.log can be write with this code:
FacesContext fc = FacesContext.getCurrentInstance();
ServletContext sc = (ServletContext) fc.getExternalContext().getContext();
sc.log("My log message for Application.log");
very simple but not find in the OC4J Doc's

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FYI,
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Hi, I am trying to debug an authentication issue using a system based on the information in this article: http://www.oracle.com/technology/products/jdev/howtos/1013/oc4jjaas/oc4j_jaas_login_module.htm
IE database/datasource based authentication.
I am getting the following error in the applications OC4J log every time a login attempt is made, no error is seen from the application, authentication simply fails.
When I had the recommended code for fine logging in the j2ee-loggin.xml file (<logger name="oracle.j2ee.security.oc4j" level="FINE" useParentHandlers="false">
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<handler name="console-handler"/>
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Log Message: September 3, 2007 10:59:51 AM EST
Component Name OC4J Component ID j2ee
Host Network Address 172.etc Message Level 1
Module ID security User ID SYSTEM
Execution Context ID 172.etc Execution Context Sequence 0
Host Name usatl01 Thread ID 12
Message Type Warning
Message Text
java.lang.NullPointerException
at javax.naming.InitialContext.getURLScheme(InitialContext.java:228)
at javax.naming.InitialContext.getURLOrDefaultInitCtx(InitialContext.java:277)
at javax.naming.InitialContext.lookup(InitialContext.java:351)
at oracle.security.jazn.login.module.db.DBTableOraDataSourceLoginModule.performDbAuthentication(DBTableOraDataSourceLoginModule.java:484)
at oracle.security.jazn.login.module.db.DBTableOraDataSourceLoginModule.login(DBTableOraDataSourceLoginModule.java:335)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at javax.security.auth.login.LoginContext.invoke(LoginContext.java:769)
at javax.security.auth.login.LoginContext.access$000(LoginContext.java:186)
at javax.security.auth.login.LoginContext$4.run(LoginContext.java:683)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.login.LoginContext.invokePriv(LoginContext.java:680)
at javax.security.auth.login.LoginContext.login(LoginContext.java:579)
at oracle.security.jazn.oc4j.OC4JUtil.doJAASLogin(OC4JUtil.java:241)
at oracle.security.jazn.oc4j.GenericUser$1.run(JAZNUserManager.java:818)
at oracle.security.jazn.oc4j.OC4JUtil.doWithJAZNClsLdr(OC4JUtil.java:173)
at oracle.security.jazn.oc4j.GenericUser.authenticate(JAZNUserManager.java:814)
at oracle.security.jazn.oc4j.FilterUser.authenticate(JAZNUserManager.java:1143)
at com.evermind.server.http.EvermindHttpServletRequest.getUserPrincipalInternal(EvermindHttpServletRequest.java:3601)
at com.evermind.server.http.AJPHttpServletRequest.getUserPrincipalInternal(AJPHttpServletRequest.java:261)
at com.evermind.server.http.HttpApplication.checkAuthenticationAndAuthorize(HttpApplication.java:6332)
at com.evermind.server.http.HttpApplication.getRequestDispatcher(HttpApplication.java:3009)
at com.evermind.server.http.HttpRequestHandler.doProcessRequest(HttpRequestHandler.java:736)
at com.evermind.server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:448)
at com.evermind.server.http.AJPRequestHandler.run(AJPRequestHandler.java:302)
at com.evermind.server.http.AJPRequestHandler.run(AJPRequestHandler.java:190)
at oracle.oc4j.network.ServerSocketReadHandler$SafeRunnable.run(ServerSocketReadHandler.java:260)
at com.evermind.util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:303)
at java.lang.Thread.run(Thread.java:595)
Supplemental Text
javax.security.auth.login.LoginException: java.lang.NullPointerException
at javax.naming.InitialContext.getURLScheme(InitialContext.java:228)
at javax.naming.InitialContext.getURLOrDefaultInitCtx(InitialContext.java:277)
at javax.naming.InitialContext.lookup(InitialContext.java:351)
at oracle.security.jazn.login.module.db.DBTableOraDataSourceLoginModule.performDbAuthentication(DBTableOraDataSourceLoginModule.java:484)
at oracle.security.jazn.login.module.db.DBTableOraDataSourceLoginModule.login(DBTableOraDataSourceLoginModule.java:335)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at javax.security.auth.login.LoginContext.invoke(LoginContext.java:769)
at javax.security.auth.login.LoginContext.access$000(LoginContext.java:186)
at javax.security.auth.login.LoginContext$4.run(LoginContext.java:683)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.login.LoginContext.invokePriv(LoginContext.java:680)
at javax.security.auth.login.LoginContext.login(LoginContext.java:579)
at oracle.security.jazn.oc4j.OC4JUtil.doJAASLogin(OC4JUtil.java:241)
at oracle.security.jazn.oc4j.GenericUser$1.run(JAZNUserManager.java:818)
at oracle.security.jazn.oc4j.OC4JUtil.doWithJAZNClsLdr(OC4JUtil.java:173)
at oracle.security.jazn.oc4j.GenericUser.authenticate(JAZNUserManager.java:814)
at oracle.security.jazn.oc4j.FilterUser.authenticate(JAZNUserManager.java:1143)
at com.evermind.server.http.EvermindHttpServletRequest.getUserPrincipalInternal(EvermindHttpServletRequest.java:3601)
at com.evermind.server.http.AJPHttpServletRequest.getUserPrincipalInternal(AJPHttpServletRequest.java:261)
at com.evermind.server.http.HttpApplication.checkAuthenticationAndAuthorize(HttpApplication.java:6332)
at com.evermind.server.http.HttpApplication.getRequestDispatcher(HttpApplication.java:3009)
at com.evermind.server.http.HttpRequestHandler.doProcessRequest(HttpRequestHandler.java:736)
at com.evermind.server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:448)
at com.evermind.server.http.AJPRequestHandler.run(AJPRequestHandler.java:302)
at com.evermind.server.http.AJPRequestHandler.run(AJPRequestHandler.java:190)
at oracle.oc4j.network.ServerSocketReadHandler$SafeRunnable.run(ServerSocketReadHandler.java:260)
at com.evermind.util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:303)
at java.lang.Thread.run(Thread.java:595)
at javax.security.auth.login.LoginContext.invoke(LoginContext.java:872)
at javax.security.auth.login.LoginContext.access$000(LoginContext.java:186)
at javax.security.auth.login.LoginContext$4.run(LoginContext.java:683)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.login.LoginContext.invokePriv(LoginContext.java:680)
at javax.security.auth.login.LoginContext.login(LoginContext.java:579)
at oracle.security.jazn.oc4j.OC4JUtil.doJAASLogin(OC4JUtil.java:241)
at oracle.security.jazn.oc4j.GenericUser$1.run(JAZNUserManager.java:818)
at oracle.security.jazn.oc4j.OC4JUtil.doWithJAZNClsLdr(OC4JUtil.java:173)
at oracle.security.jazn.oc4j.GenericUser.authenticate(JAZNUserManager.java:814)
at oracle.security.jazn.oc4j.FilterUser.authenticate(JAZNUserManager.java:1143)
at com.evermind.server.http.EvermindHttpServletRequest.getUserPrincipalInternal(EvermindHttpServletRequest.java:3601)
at com.evermind.server.http.AJPHttpServletRequest.getUserPrincipalInternal(AJPHttpServletRequest.java:261)
at com.evermind.server.http.HttpApplication.checkAuthenticationAndAuthorize(HttpApplication.java:6332)
at com.evermind.server.http.HttpApplication.getRequestDispatcher(HttpApplication.java:3009)
at com.evermind.server.http.HttpRequestHandler.doProcessRequest(HttpRequestHandler.java:736)
at com.evermind.server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:448)
at com.evermind.server.http.AJPRequestHandler.run(AJPRequestHandler.java:302)
at com.evermind.server.http.AJPRequestHandler.run(AJPRequestHandler.java:190)
at oracle.oc4j.network.ServerSocketReadHandler$SafeRunnable.run(ServerSocketReadHandler.java:260)
at com.evermind.util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:303)
at java.lang.Thread.run(Thread.java:595)

Well, still struggling with this one.. although i've managed to get fine oc4j security logging enabled through the console, the error stream now follows this sequence of events at each login attempt :
[DBTableOraDataSourceLoginModule]login called on DBTableLoginModule
[DBTableOraDataSourceLoginModule]Calling callbackhandler ...
[DBTableOraDataSourceLoginModule]Username returned by callback = TATKINS
[DBTableOraDataSourceLoginModule]Username changed to case as defined by null to TATKINS
[DBTableOraDataSourceLoginModule]Abort called on LoginModule
java.lang.NullPointerException
at javax.naming.InitialContext.getURLScheme(InitialContext.java:228)
at javax.naming.InitialContext.getURLOrDefaultInitCtx(InitialContext.java:277)
at javax.naming.InitialContext.lookup(InitialContext.java:351)
at oracle.security.jazn.login.module.db.DBTableOraDataSourceLoginModule.performDbAuthentication(DBTableOraDataSourceLoginModule.java:484)
at oracle.security.jazn.login.module.db.DBTableOraDataSourceLoginModule.login(DBTableOraDataSourceLoginModule.java:335)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
etc etc...
JAAS-OC4J: Authentication failure for user: TATKINS
JAAS-OC4J: Membership check for group: USER failed for user: anonymous
What i cant work out is what is causing the login module to abort and raise a null pointer exception. Could this be due to a configuration mistake in the console manager or one of the xml files prior to deployment? I just have no idea how to approach fixing this issue.
I really would appreciate some assistance, 5+ days trying to get this working. I had this working on jdeveloper embedded oc4j, and all the tute's on standalone deployment pass off the configuration of standalone as simple compared to embedded, yet don't go into enough detail to get it working, atleast from my perspective.

Where is the default location for the OC4J logs?

Where is the default location for the OC4J logs?

Depends on what variant of the product you are using.
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[060411_111105559][][ERROR] Could not create an image. Set html-image-dir and html-image-base-uri correctly.
[060411_111108074][][ERROR] Could not create an image. Set html-image-dir and html-image-base-uri correctly.
[060411_111109590][][ERROR] Could not create an image. Set html-image-dir and html-image-base-uri correctly.
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[060411_111134933][][ERROR] Could not create an image. Set html-image-dir and html-image-base-uri correctly.
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Thanks,
Suresh.

"Could not create an image. Set html-image-dir and html-image-base-uri correctly."
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