Ariela Carrera schrieb am 24.11.2008 um 09:40:40 (-0800): > 1) The servlet loading problem happens when I startup Tomcat, > manually, as I always do, showing the exception: > > java.lang.NoClassDefFoundError: javax/servlet/http/HttpServlet > java.lang.ClassLoader.defineClass1(Native Method) > java.lang.ClassLoader.defineClass(ClassLoader.java:620)
That's like you find out your car has no wheels. You said you've manipulated Tomcat's startup script. Don't do that. Make a clean install and it should work. > 2) When the first problem does not happen, the http session works > unproperly, and some attributes of the session are made null, in this > case, Tomcat throws the NullPointerException, but if I reload the jsp > everything is ok. This sounds like something in the session isn't properly initialized. I'd say this is an error in your application. > 2) About an earlier Tomcat: I just downloaded the 6.0.18 version and > catalina.sh it's running ok (but I have not put my webapp there yet). Careful! :-) > 3) About the db2 jdbc driver, well, it is allocated in many paths... > > JAVA_HOME/jdk/jre/lib/ext/db2jcc.jar Placing the driver here makes it available to everything run via this JVM, including Tomcat and your web applications. > CATALINA_HOME/lib/db2jcc.jar Placing the driver here makes it available to both Tomcat and all web applications. It allows you to use the connection pool with this driver. > CATALINA_HOME/webapps/cqaex/db2jcc.jar Placing the driver here makes it available for download in the cqaex web application. > CATALINA_HOME/webapps/peerca/WEB-INF/lib/db2jcc.jar Placing the driver here makes it available only to the web application peerca. It is (a) redundant when the driver is already placed in CATALINA_HOME/lib, and (b) won't allow you, on its own, to use the connection pool. It only allows you to load the driver via the DriverManager. > DB2_HOME/V9.5/java/db2jcc.jar This is probably the place of the driver in the DB2 distribution. Won't hurt. > ¿Can this cause troubles? Where exactly I need to put this file, > taking into account I need driver be avalaible for other java > aplications, not only for tomcat webapps? If you want to think of Tomcat as independent of the JVM you run it with, place the driver in "Tomcat6/lib" or reference it from "Tomcat6/conf/catalina.properties". > 5) About running Tomcat as root user: can this cause troubles too? Do > I need to running it as the common user? What kind of properties > (chmod) does the CATALINA_HOME need to work in many users without > running as a root? It's not considered good practice to have a service run as root when there is no need to do so. The root user is very powerful, so it's potentially dangerous expose a process run as root to the world. Tomcat should probably be run as www-data or whatever it is called on your system. All permissions issues can be handled by using chmod and chown. I don't know your particular situation, but it's unlikely you have to resort to running Tomcat as root. > I am not using any Eclipse, I just write manually my codes Very good! So you don't lose the ground under your feet. > Now I just try with the 6.0.18 and I will put my webapp there. The > only error is with DB2 connections, although the session has the > connection, this is not null but when i tried to list the tables some > error happens: > ------------------ > com.ibm.db2.jcc.b.nm: DB2 SQL Error: SQLCODE=-204, SQLSTATE=42704, > SQLERRMC=DB2INST1.AM_BASE_TASKS, DRIVER=3.50.152 Sounds like an SQL error to me. Look it up in your IBM manual. > at com.ibm.db2.jcc.b.wc.a(wc.java:579) > at com.ibm.db2.jcc.b.wc.a(wc.java:57) > at com.ibm.db2.jcc.b.wc.a(wc.java:126) Reasonable package names. Got to get an IBM database, too. > at java.lang.Thread.run(Thread.java:619) > ----------- > and this error did not happen in the older version... any ideas? Where > the db2jcc.jar needs to be, to be available for all my applications in > java (not only in Tomcat). Read this: http://mail-archives.apache.org/mod_mbox/tomcat-users/200811.mbox/[EMAIL PROTECTED] Short answer for Tomcat 6: Either put the driver in $Tomcat/lib, or add it to the "common.loader" in "conf/catalina.properties". > The idea I have is to create a pool of connections. I read the concept > but now I need to implement it. Is Tomcat deal with the pool or I need > to ask help in DB2 forums ? It'll probably work the same way as for other database servers. In order for this to work, both Tomcat and your webapp need to be able to see the driver. I hope this helps. Michael Ludwig --------------------------------------------------------------------- To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
