Re: “java.lang.NullPointerException” with JDBC connection from InitialContext
Just some suggestions that come to mind: Have you considered googling for StringUtils indexOfIgnoreCaseRespectQuotes? E.g. it may be Connector/J bug #25047 fixed in v. 5.0.5 Check, what version of MySQL Connector/J you are using. OK, problem solved. For the record I did search on that, and looked into it originally. But stupidly, I verified that my test Connector/J was version v5.0.5 or later,... but must not have check the server. Sure enough the host had v5.0.2. Upgrading the driver resolved this. Thank you Konstantin. Thank you everyone who responded to my issue. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Jar wars - Conflicting classes
Windows XP SP 3 Tomcat 6.0.1 JVM 1.6.0 Must all conflicting classes be sorted out on one instance of Tomcat? I have learned not to put application jars (classes) in the jre lib, since they then become common to all applications and if there is a duplicate, but not exact duplicate, then things crash. What I am wondering is, are all the classes loaded into the _same_ JVM? Here is the problem I ran into. Application #1 uses some Quartz scheduling classes. Application #2 also uses Quartz, but apparently a different version. Can these applications live on the same Tomcat instance? In other words if each of the applications has it's own lib, can the classes overlap? I get the feeling the applications will have to be sorted out to use the same Quart library. I read the documentation regarding Class Loader and understand the order in which libraries are searched, but do the classes end up in one single aggregated JVM memory? - Dave
Re: Jar wars - Conflicting classes
2009/1/3 David.Meldrum david.meld...@verizon.net: Windows XP SP 3 Tomcat 6.0.1 JVM 1.6.0 Must all conflicting classes be sorted out on one instance of Tomcat? I have learned not to put application jars (classes) in the jre lib, since they then become common to all applications and if there is a duplicate, but not exact duplicate, then things crash. What I am wondering is, are all the classes loaded into the _same_ JVM? Here is the problem I ran into. Application #1 uses some Quartz scheduling classes. Application #2 also uses Quartz, but apparently a different version. Can these applications live on the same Tomcat instance? In other words if each of the applications has it's own lib, can the classes overlap? I get the feeling the applications will have to be sorted out to use the same Quart library. I read the documentation regarding Class Loader and understand the order in which libraries are searched, but do the classes end up in one single aggregated JVM memory? You can put them in WEB-INF/lib folders of your applications and they will happily coexist separately. The problem will occur is some of them are put into the common lib folder of Tomcat, or, even worse, into JRE lib folder, as you mentioned. Well, the problem do not occur always. It depends. It depends on how the library is used, what are its dependencies, but when it occurs, the easiest answer is to remove the library either from the application or from commons. I may add that a) classloader delegation rules in web applications are different from those of core Java. You may read [1] and try to figure what implications that impose. b) web applications may be unloaded, reloaded and thus the classes may have gone away. Thus classloader issues are more observable here than in a standalone application. For reference, [1] http://tomcat.apache.org/tomcat-6.0-doc/class-loader-howto.html Best regards, Konstantin Kolinko - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
RE: Redeploy leaks
Memory leak is an advanced task. But once understood is very easy to fix
them, just follow some simple rules, most common situations are: 1) Not
de-registering jdbc driver, 2) shutdown log4j after use.
To de-register jdbc driver just put this code in the contextDestroyed()
method inside a ServletContextListener in your application:
System.out.println(unloading drivers for classLoader: [ +
Integer.toHexString(getClass().getClassLoader().hashCode()) + ]);
try {
for (java.util.Enumeration e = java.sql.DriverManager.getDrivers();
e.hasMoreElements();)
{
java.sql.Driver driver = (java.sql.Driver) e.nextElement();
if (driver.getClass().getClassLoader() ==
getClass().getClassLoader())
{
java.sql.DriverManager.deregisterDriver(driver);
System.out.println(driver.getClass().getName() +
unloaded.);
}
else
System.out.println(driver.getClass().getName() + not
unloaded.);
}
} catch (Throwable e) {
System.err.println(Failed to cleanup ClassLoader for webapp);
e.printStackTrace();
}
For the log4j issue you can include also this code:
org.apache.commons.logging.LogFactory.release(Thread.currentThread().get
ContextClassLoader());
org.apache.log4j.LogManager.shutdown();
Of course there are lots of issues to handle with... you can also read:
http://tomcat.apache.org/faq/memory.html
-Original Message-
From: Adriano dos Santos Fernandes [mailto:adrian...@uol.com.br]
Sent: Viernes, 19 de Diciembre de 2008 09:20 p.m.
To: users@tomcat.apache.org
Subject: Redeploy leaks
Hi!
As I had having OutOfMemory exceptions (PermGen) when redeploying an
application, I started to verify things using Eclipse Memory Analyzer.
I've discovered some real leaks, for example caused by the Java Disposer
thread being instantiated using the Webapp classloader. After fix this,
when I redeploy the application, Memory Analyzer shows that there are no
non-weak/soft references to the undeployed classloader. But it (and the
classes allocated by it) is never garbaged collected.
I've tried different VM switches (-XX:+CMS*) and none make the
classloader be collected. Thinking about word Perm (permanent) and
some sources, I've done non-web testing and there a custom classloader
*is* garbaged collected.
So what could be the problem when running in Tomcat?
I'm using Tomcat 6.0.18, JDK 1.6.0-10 (Linux and Windows) and Apache
Wicket. I've not put any libraries in tomcat/lib, they are all on the
WEB-INF/lib. Wicket uses ThreadGlobals, but I don't think this may be a
problem, because Eclipse Memory Analyzer seems to show references from
them, but it didn't show any references in my case!
Increasing the permgen size is not something I'm looking for. I'd rather
prefer to see unused memory being deallocated.
Adriano
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Change JSP Environment.
Hello, I want to change the default user file-dir. for instance: /users/user1/ System: java 1.5.0_14, tomcat 6.0.18, os debian. Configuration: system.xml: Host name=test2.domain.at debug=0 unpackWARs=true Logger className=org.apache.catalina.logger.FileLogger directory=logs prefix=virtual_log. suffix=.txt timestamp=true/ Context path= docBase=/users/user1/public_html debug=0 reloadable=true/ Valve className=org.apache.catalina.valves.AccessLogValve directory=logs prefix=virtual_log. suffix=.txt pattern=common/ /Host I've test it with a command (new File(.) ) in a JSP and the result of the getCanonicalPath is the tomcat -home and not /users/user1/. I've tried without success the attributes appBase and |workDir|. Thanks. Greedings Stefan |* *|*||***
Classpath problem
Hello. I am using Tomcat 6.0.18, my Java version is 1.6.0_11 and I have a servlet called TestingServlet.java. My classpath reads like this: .;C:\Sun\SDK\bin; C:\Sun\SDK\jdk\bin; C:\Tomcat\lib\servlet-api.jar I cannot compile in DOS without typing: javac -classpath C:\Tomcat\lib\servlet-api.jar TestingServlet.java I cannot understand why I am being required to specify the servlet api when I have it in my classpath. I have looked through the manual and Googled for an answer to this problem without success. Can anyone help me out? Thanks. **New year...new news. Be the first to know what is making headlines. (http://www.aol.com/?ncid=emlcntaolcom0026)
Re: Classpath problem
2009/1/4 fhserkl...@aol.com: Hello. I am using Tomcat 6.0.18, my Java version is 1.6.0_11 and I have a servlet called TestingServlet.java. My classpath reads like this: .;C:\Sun\SDK\bin; C:\Sun\SDK\jdk\bin; C:\Tomcat\lib\servlet-api.jar I cannot compile in DOS without typing: javac -classpath C:\Tomcat\lib\servlet-api.jar TestingServlet.java I cannot understand why I am being required to specify the servlet api when I have it in my classpath. I guess that is because spaces are not allowed in the value. Try: set CLASSPATH=.;C:\Sun\SDK\bin;C:\Sun\SDK\jdk\bin;C:\Tomcat\lib\servlet-api.jar or better set CLASSPATH=.;C:\Tomcat\lib\servlet-api.jar I do not know why you are adding those bin folders to the classpath. There are no class files there. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
set tomcat max session allow
may i know is there any guidelines/info on how to set maximum limit of sessions allow for each webapp and redirect user to a static html page is exceeded . I already did my google and people mentioned need to do it directly on java codes rather than tomcat configuration,but they didn't mentioned how.. can elaborate? 2. i know maxThread in sever.xml can be use to increase more sessions. but i don't see this option able to redirect user to static html page is exceeded
