question reg. reading JNDI env entries
Hi, I am using logback-classic (0.9.28) for a web application running on tomcat 5.5. I am trying to read the JNDI env entry values using the <insertFromJNDI env-entry-name="java:comp/env/stderr-logging" as="stdErrLogging" /> tag in the logback.xml file. I have lots of env entry values that can be read from META-INF/context.xml file. For this specific example, my context.xml file has this. <context> .... <Environment name="stderr-logging" type="java.lang.String" value="true"/> .... But, this insertFromJNDI tags always says the entry value is null or empty. However, Once I am in a servlet code, new InitialContext().lookup("java:comp/env/stderr-logging") retrieves the correct value from context xml file. I looked in the JNDIUtil class from ch.qos.logback.classic.util package and the code throws error saying "javax.naming.NameNotFoundException: Name java:comp is not bound in this Context". Would somebody know how to read the environment entry values from the META-INF/context.xml file ? Thanks for help Ravi
Hello Ravi, This is quite strange because for some name 'n', the JNDI lookup code in logback essentially does InitialContext().lookup(n) the same code that seems to work for you. Could the discrepency be attributed to differences in the class loader for logback and the servlet code which is able to correctly read the JNDI entries? Where are the logback classes located on your application's class path? -- Ceki On 06/06/2011 10:25 PM, Ravikanth Gangarapu wrote:
Hi,
I am using logback-classic (0.9.28) for a web application running on tomcat 5.5.
I am trying to read the JNDI env entry values using the <insertFromJNDI env-entry-name="java:comp/env/stderr-logging" as="stdErrLogging" /> tag in the logback.xml file.
I have lots of env entry values that can be read from META-INF/context.xml file. For this specific example, my context.xml file has this.
<context>
….
<Environment name="stderr-logging" type="java.lang.String" value="true"/>
….
But, this insertFromJNDI tags always says the entry value is null or empty. However, Once I am in a servlet code, new InitialContext().lookup(“java:comp/env/stderr-logging") retrieves the correct value from context xml file.
I looked in the JNDIUtil class from ch.qos.logback.classic.util package and the code throws error saying “javax.naming.NameNotFoundException: Name java:comp is not bound in this Context”.
Would somebody know how to read the environment entry values from the META-INF/context.xml file ?
Thanks for help
Ravi
Hi Ceki, I have logback-core, classic, janino, commons-compiler jar files located under WEB-INF/lib folder, and the logback.xml is under WEB-INF/classes. In the console, the logback logs appear ahead of the application specific servlet and filter (from web.xml) init method System out statements. I have modified the InsertFromJNDIAction class to print its classloader and did the same for servlet and filter init methods too. All of them printed the same class loader name. So, I added, ClassLoader loader = Thread.currentThread().getContextClassLoader(); System.out.println("InsertFromJNDIAction "+loader.getClass().getName()+" "+loader.hashCode()+" "+loader.toString()); org.apache.catalina.loader.WebappClassLoader 1024180126 WebappClassLoader delegate: false repositories: /WEB-INF/classes/ ----------> Parent Classloader: org.apache.catalina.loader.StandardClassLoader@46c837cd The jndi context lookup is successful in servlet and filter init methods to print the env-entry-value. Logback still threw the error for lookup. Thanks for your help Ravi -----Original Message----- From: logback-user-bounces@qos.ch [mailto:logback-user-bounces@qos.ch] On Behalf Of Ceki Gülcü Sent: Monday, June 06, 2011 5:15 PM To: logback users list Subject: Re: [logback-user] question reg. reading JNDI env entries Hello Ravi, This is quite strange because for some name 'n', the JNDI lookup code in logback essentially does InitialContext().lookup(n) the same code that seems to work for you. Could the discrepency be attributed to differences in the class loader for logback and the servlet code which is able to correctly read the JNDI entries? Where are the logback classes located on your application's class path? -- Ceki On 06/06/2011 10:25 PM, Ravikanth Gangarapu wrote:
Hi,
I am using logback-classic (0.9.28) for a web application running on tomcat 5.5.
I am trying to read the JNDI env entry values using the <insertFromJNDI env-entry-name="java:comp/env/stderr-logging" as="stdErrLogging" /> tag in the logback.xml file.
I have lots of env entry values that can be read from META-INF/context.xml file. For this specific example, my context.xml file has this.
<context>
..
<Environment name="stderr-logging" type="java.lang.String" value="true"/>
..
But, this insertFromJNDI tags always says the entry value is null or empty. However, Once I am in a servlet code, new InitialContext().lookup("java:comp/env/stderr-logging") retrieves the correct value from context xml file.
I looked in the JNDIUtil class from ch.qos.logback.classic.util package and the code throws error saying "javax.naming.NameNotFoundException: Name java:comp is not bound in this Context".
Would somebody know how to read the environment entry values from the META-INF/context.xml file ?
Thanks for help
Ravi
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Thread.currentThread().getContextClassLoader() is the context class loader which may be different than the "current" class loader, i.e. the class loader which loaded the class currently executing. You can get the current class loader by invoking this.getClassLoader() on any object. When you say that InsertFromJNDIAction instance and your servlet and filters instances have the same class loader, do you mean the same context class loader (with respect to the currently executing thread) or the class loader of the instances themselves? Also note that the context class loader for the current thread is set some time during the initialization of your web-app by Tomcat by calling the setContextClassLoader method on the current thread. I am beginning to suspect that logback is being initialized before Tomcat has a chance to invoke setContextClassLoader. Is that plausible? -- Ceki On 07/06/2011 12:00 AM, Ravikanth Gangarapu wrote:
Hi Ceki, I have logback-core, classic, janino, commons-compiler jar files located under WEB-INF/lib folder, and the logback.xml is under WEB-INF/classes. In the console, the logback logs appear ahead of the application specific servlet and filter (from web.xml) init method System out statements.
I have modified the InsertFromJNDIAction class to print its classloader and did the same for servlet and filter init methods too. All of them printed the same class loader name.
So, I added,
ClassLoader loader = Thread.currentThread().getContextClassLoader(); System.out.println("InsertFromJNDIAction "+loader.getClass().getName()+" "+loader.hashCode()+" "+loader.toString());
org.apache.catalina.loader.WebappClassLoader 1024180126 WebappClassLoader delegate: false repositories: /WEB-INF/classes/ ----------> Parent Classloader: org.apache.catalina.loader.StandardClassLoader@46c837cd
The jndi context lookup is successful in servlet and filter init methods to print the env-entry-value. Logback still threw the error for lookup.
Thanks for your help Ravi
-----Original Message----- From: logback-user-bounces@qos.ch [mailto:logback-user-bounces@qos.ch] On Behalf Of Ceki Gülcü Sent: Monday, June 06, 2011 5:15 PM To: logback users list Subject: Re: [logback-user] question reg. reading JNDI env entries
Hello Ravi,
This is quite strange because for some name 'n', the JNDI lookup code in logback essentially does InitialContext().lookup(n) the same code that seems to work for you. Could the discrepency be attributed to differences in the class loader for logback and the servlet code which is able to correctly read the JNDI entries? Where are the logback classes located on your application's class path?
-- Ceki
On 06/06/2011 10:25 PM, Ravikanth Gangarapu wrote:
Hi,
I am using logback-classic (0.9.28) for a web application running on tomcat 5.5.
I am trying to read the JNDI env entry values using the<insertFromJNDI env-entry-name="java:comp/env/stderr-logging" as="stdErrLogging" /> tag in the logback.xml file.
I have lots of env entry values that can be read from META-INF/context.xml file. For this specific example, my context.xml file has this.
<context>
..
<Environment name="stderr-logging" type="java.lang.String" value="true"/>
..
But, this insertFromJNDI tags always says the entry value is null or empty. However, Once I am in a servlet code, new InitialContext().lookup("java:comp/env/stderr-logging") retrieves the correct value from context xml file.
I looked in the JNDIUtil class from ch.qos.logback.classic.util package and the code throws error saying "javax.naming.NameNotFoundException: Name java:comp is not bound in this Context".
Would somebody know how to read the environment entry values from the META-INF/context.xml file ?
Thanks for help
Ravi
Hi Ceki, I tried with the following two ways to get the classloaders. The classloader is same in InsertFromJNDIAction and in a servlet init method. It's always coming up as org.apache.catalina.loader.WebappClassLoader with same hashcode. Thread.currentThread().getContextClassLoader() this.getClass().getClassLoader Its possible logback is initialized before Tomcat has a chance to invoke setContextClassLoader. Is there a way to make logback wait until Tomcat sets the context classloader? Also, I have tried to programmatically invoke configure.configure("my_logback.xml") from a servlet init method, then I am able to read the env-entries correctly. I think that the java:comp context is available only to java EE components. So, in that case, automatic detection mechanism for logback files will never be able to access env-entries from context.xml file? I've also observed that, with automatic file detection and load mechanism, env entries in web.xml are also not available. Thanks Ravi -----Original Message----- From: logback-user-bounces@qos.ch [mailto:logback-user-bounces@qos.ch] On Behalf Of Ceki Gülcü Sent: Tuesday, June 07, 2011 6:15 PM To: logback users list Subject: Re: [logback-user] question reg. reading JNDI env entries Thread.currentThread().getContextClassLoader() is the context class loader which may be different than the "current" class loader, i.e. the class loader which loaded the class currently executing. You can get the current class loader by invoking this.getClassLoader() on any object. When you say that InsertFromJNDIAction instance and your servlet and filters instances have the same class loader, do you mean the same context class loader (with respect to the currently executing thread) or the class loader of the instances themselves? Also note that the context class loader for the current thread is set some time during the initialization of your web-app by Tomcat by calling the setContextClassLoader method on the current thread. I am beginning to suspect that logback is being initialized before Tomcat has a chance to invoke setContextClassLoader. Is that plausible? -- Ceki On 07/06/2011 12:00 AM, Ravikanth Gangarapu wrote:
Hi Ceki, I have logback-core, classic, janino, commons-compiler jar files located under WEB-INF/lib folder, and the logback.xml is under WEB-INF/classes. In the console, the logback logs appear ahead of the application specific servlet and filter (from web.xml) init method System out statements.
I have modified the InsertFromJNDIAction class to print its classloader and did the same for servlet and filter init methods too. All of them printed the same class loader name.
So, I added,
ClassLoader loader = Thread.currentThread().getContextClassLoader(); System.out.println("InsertFromJNDIAction "+loader.getClass().getName()+" "+loader.hashCode()+" "+loader.toString());
org.apache.catalina.loader.WebappClassLoader 1024180126 WebappClassLoader delegate: false repositories: /WEB-INF/classes/ ----------> Parent Classloader: org.apache.catalina.loader.StandardClassLoader@46c837cd
The jndi context lookup is successful in servlet and filter init methods to print the env-entry-value. Logback still threw the error for lookup.
Thanks for your help Ravi
-----Original Message----- From: logback-user-bounces@qos.ch [mailto:logback-user-bounces@qos.ch] On Behalf Of Ceki Gülcü Sent: Monday, June 06, 2011 5:15 PM To: logback users list Subject: Re: [logback-user] question reg. reading JNDI env entries
Hello Ravi,
This is quite strange because for some name 'n', the JNDI lookup code in logback essentially does InitialContext().lookup(n) the same code that seems to work for you. Could the discrepency be attributed to differences in the class loader for logback and the servlet code which is able to correctly read the JNDI entries? Where are the logback classes located on your application's class path?
-- Ceki
On 06/06/2011 10:25 PM, Ravikanth Gangarapu wrote:
Hi,
I am using logback-classic (0.9.28) for a web application running on tomcat 5.5.
I am trying to read the JNDI env entry values using the<insertFromJNDI env-entry-name="java:comp/env/stderr-logging" as="stdErrLogging" /> tag in the logback.xml file.
I have lots of env entry values that can be read from META-INF/context.xml file. For this specific example, my context.xml file has this.
<context>
..
<Environment name="stderr-logging" type="java.lang.String" value="true"/>
..
But, this insertFromJNDI tags always says the entry value is null or empty. However, Once I am in a servlet code, new InitialContext().lookup("java:comp/env/stderr-logging") retrieves the correct value from context xml file.
I looked in the JNDIUtil class from ch.qos.logback.classic.util package and the code throws error saying "javax.naming.NameNotFoundException: Name java:comp is not bound in this Context".
Would somebody know how to read the environment entry values from the META-INF/context.xml file ?
Thanks for help
Ravi
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participants (2)
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Ceki Gülcü -
Ravikanth Gangarapu