java-devel December 2005

java-devel@lists.fedoraproject.org

20 participants
36 discussions

Images and Tomcat under Fedora
by Wellington L.S. da Silva 13 Dec '05

13 Dec '05

I'm new to the list, pretty fresh on Fedora, and this first message of mine is about how to configure a Fedora box with Tomcat and Java to serve high definition graphics. I work for the UN and I'm trying to setup a box for my mapping and eGis projects, but, from time to time, the graphics server (XServer?) just crashed leaving me bad. Any ideas on how to serve images (mostly png, jpeg, tiff, or gif) with Tomcat? Thanks, Wellington

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How to debug a Tomcat5 servlet on Fedora
by Ryan McDougall 13 Dec '05

13 Dec '05

I hope this is one topic for this list, if not a redirect would be greatly appreciated. I am trying to set up a simple servlet, which according to various tutorials, should work. However it doesnt, and I am unable to find out why. The tomcat manager simply tells me "FAIL - Application at context path /myservlet could not be started" and thats it. My question is how can I tease out enough information to discover what the problem is? I am a decently experienced programmer, so _any_ sekret kungfu would be helpful. This is a high priority for my company, so thats all Im working on at the moment, but Im stuck without the tools to debug+solve my own problem ATM. Java Source: import javax.servlet.http.*; import java.io.*; public class TestWebApp extends HttpServlet { static final long serialVersionUID =0; public void doPost (HttpServletRequest req, HttpServletResponse resp) throws IOException { resp.setContentType ("text/html"); PrintWriter out = resp.getWriter (); out.println ("w00t"); } } web.xml: <web-app xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3c.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd" version="2.4> <servlet> <servlet-name>testapp</servlet-name> <servlet-class>TestWebApp</servlet-class> </servlet> <servlet-mapping> <servlet-name>testapp</servlet-name> <url-pattern>/myservlet/*.do</url-pattern> </servlet-mapping> </web-app> deployed in $CATALINA_HOME/webapps/myservlet ./myservlet/WEB-INF/web.xml ./myservlet/WEB-INF/classes/TestWebApp.class ./myservlet/WEB-INF/lib When I try to start the servlet the relevant output of tail /var/log/tomcat5/localhost_log.2005-12-13.txt: 2005-12-13 11:19:56 StandardContext[/manager]HTMLManager: init: Associated with Deployer 'localhost' 2005-12-13 11:19:56 StandardContext[/manager]HTMLManager: init: Global resources are available 2005-12-13 11:19:56 StandardContext[/manager]HTMLManager: list: Listing contexts for virtual host 'localhost' 2005-12-13 11:20:02 StandardContext[/manager]HTMLManager: start: Starting web application at '/myservlet' 2005-12-13 11:20:02 StandardContext[/manager]HTMLManager: list: Listing contexts for virtual host 'localhost' Which errors out with: FAIL - Application at context path /myservlet could not be started ps. Should be an up-to-date stock fedora core 4: tomcat5-servlet-2.4-api-javadoc-5.0.30-5jpp_6fc tomcat5-jasper-5.0.30-5jpp_6fc tomcat5-jasper-javadoc-5.0.30-5jpp_6fc tomcat5-5.0.30-5jpp_6fc tomcat5-webapps-5.0.30-5jpp_6fc tomcat5-servlet-2.4-api-5.0.30-5jpp_6fc tomcat5-admin-webapps-5.0.30-5jpp_6fc java-1.4.2-gcj-compat-debuginfo-1.4.2.0-40jpp_31rh.FC4.2 java-1.4.2-gcj-compat-devel-1.4.2.0-40jpp_31rh.FC4.2 java-1.4.2-gcj-compat-1.4.2.0-40jpp_31rh.FC4.2 libgcj-4.0.2-8.fc4 libgcj-devel-4.0.2-8.fc4 libgcj-src-4.0.2-8.fc4 java-1.4.2-gcj-compat-src-1.4.2.0-40jpp_31rh.FC4.2 but I also have the sun sdk installed: /usr/sbin/alternatives --display java java - status is auto. link currently points to /usr/lib/jvm/jre-1.4.2-gcj/bin/java /usr/java/jdk1.5.0_04/bin/java - priority 2 slave rmiregistry: /usr/java/jdk1.5.0_04/bin/rmiregistry slave jre_exports: (null) slave jre: /usr/java/jdk1.5.0_04/jre/ /usr/lib/jvm/jre-1.4.2-gcj/bin/java - priority 1420 slave rmiregistry: /usr/lib/jvm/jre-1.4.2-gcj/bin/rmiregistry slave jre_exports: /usr/lib/jvm-exports/jre-1.4.2-gcj slave jre: /usr/lib/jvm/jre-1.4.2-gcj Current `best' version is /usr/lib/jvm/jre-1.4.2-gcj/bin/java. /usr/sbin/alternatives --display javac javac - status is auto. link currently points to /usr/lib/jvm/java-1.4.2-gcj/bin/javac /usr/lib/jvm/java-1.4.2-gcj/bin/javac - priority 1420 slave java_sdk: /usr/lib/jvm/java-1.4.2-gcj slave java_sdk_exports: /usr/lib/jvm-exports/java-1.4.2-gcj slave javadoc: /usr/lib/jvm/java-1.4.2-gcj/bin/javadoc slave javah: /usr/lib/jvm/java-1.4.2-gcj/bin/javah slave jar: /usr/lib/jvm/java-1.4.2-gcj/bin/jar slave rmic: /usr/lib/jvm/java-1.4.2-gcj/bin/rmic Current `best' version is /usr/lib/jvm/java-1.4.2-gcj/bin/javac. Cheers, Ryan

2 2

building Eclipse plugins
by Anthony Green 12 Dec '05

12 Dec '05

I used to think building Eclipse plugins from source was hard. I don't know why I didn't notice this before, but you can right click on the plugin.xml file and generate a build.xml that just works. So I've packaged the SchemeScript Eclipse plugin. Here's my first crack at it: http://people.redhat.com/green/FC/SchemeScript-1.1.4-1.src.rpm . Here's a screenshot: http://spindazzle.org/green/pics/20051204-SchemeScript.png SchemeScript is really nice. It works with kawa (in-process or out), or any number of other external scheme implementations, and has pretty much every feature you might find in emacs scheme mode and more (backtrace view, outline view, a special canvas view (see screenshot), terrific integrated documentation, etc). I hope to get this into Extras for FC5. AG

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xalan build
by Anthony Green 11 Dec '05

11 Dec '05

I'm not sure who is working on the GCC 4.1 rebuild of the java packages right now, but I found I had to apply the following patch to xalan-j2 to get it to build. This probably has more to do with the recent Eclipse upgrade more than anything else. AG

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Re: Why does tomcat5 stop automaticlly after started
by Mike Zang 05 Dec '05

05 Dec '05

I installed tomcat5 and mod_jk on FC4 as below: yum install tomcat5 tomcat5-webapps tomcat5-admin-webapps mod_jk I cound't find startup.sh and stop.sh, there are only three files in bin: -rw-r--r-- 1 root root 30231 May 10 2005 bootstrap.jar -rwxr-xr-x 1 root root 713 May 10 2005 relink -rwxr-xr-x 1 root root 341 May 10 2005 reloctomcat5 and I used service tomcat5 start, At the first, the tomcat5 is ok, but after I reboot the server, the tomcat soon stop after started, I can find it as below after started: tomcat 3885 1 18 15:28 pts/2 00:00:06 /usr/lib/jvm/java/bin/java -Djava.endorsed.dirs=/usr/share/tomcat5/common/endorsed -classpath /usr/lib/jvm/java/lib/tools.jar:/usr/share/tomcat5/bin/bootstrap.jar:/usr/share/java/commons-logging-api.jar:/usr/share/java/mx4j/mx4j.jar -Dcatalina.base=/usr/share/tomcat5 -Dcatalina.home=/usr/share/tomcat5 -Djava.io.tmpdir=/usr/share/tomcat5/temp org.apache.catalina.startup.Bootstrap start Can you help me?

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lib-foo-bar magic name class loading
by Anthony Green 04 Dec '05

04 Dec '05

Eclipse starts 15 to 20 seconds faster for me when I start it like so... eclipse -vmargs -Dgnu.gcj.runtime.VMClassLoader.library_control=never This is because it's doing over 60,000 fewer failing file-system calls (trying to open non-existent libraries). Should we change libgcj's default behaviour? If not, adding -Dgnu.gcj.runtime.VMClassLoader.library_control=never to startup scripts like /usr/bin/eclipse seems like a good idea. AFAIK we don't rely on this old class loading trick. AG

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java-devel December 2005