Vinants Blog

GWT Tomcat Integration - Making Google Web toolkit work with Apache Tomcat

2011-02-10T19:29:00.000-08:00

This is my quick and easy way to make GWT work with Tomcat.

Ingredients:

GWT on Eclipse
Apache Tomcat (I have 5.5.26)

Lets create a new GWT Project called "test".

Also download and copy the "tomcat-gwt.xml" to the "test" Project directory.
Edit the tomcat-gwt.xml files and add your project specific settings.

<property name="tomcat.webapps" value="C:\apache-tomcat-5.5.26\webapps" />
<property name="project.name" value="test" />

Change the above settings to your specific settings.

Now add this builder to your project.
Right Click Project ("test") >> Properties >> Builders

Select import to add the XML.

Make sure the tasks are selected as displayed below.

The application is deployed to tomcat everytime you do a "CLEAN".

Contents of "tomcat-gwt.xml"

<?xml version="1.0" encoding="UTF-8"?>
<project name="Tomcat-GWT" default="copy" basedir=".">
    <property name="tomcat.webapps" value="C:\apache-tomcat-5.5.26\webapps" />
    <property name="project.name" value="test" />
    <property name="source.dir" value="${basedir}\war" />
    <target name="copyx">
        <echo>${source.dir}</echo>
        <echo>${tomcat.webapps}</echo>
    </target>
    <target name="copy">
        <mkdir dir="${tomcat.webapps}\${project.name}" />
        <copy todir="${tomcat.webapps}\${project.name}">
            <fileset dir="${source.dir}" includes="**/**" />
        </copy>
    </target>
</project>

Websphere - XA Transaction Error

2011-01-28T15:28:00.000-08:00

Problem
[1/28/11 18:26:02:109 EST] 00000014 XARminst      E   WTRN0037W: The transaction service encountered an error on an xa_recover operation. The resource was com.ibm.ws.rsadapter.spi.WSRdbXaResourceImpl@51ef51ef. The error code was XAER_RMERR. The exception stack trace follows: javax.transaction.xa.XAException
    at oracle.jdbc.xa.OracleXAResource.recover(OracleXAResource.java:526)
    at com.ibm.ws.rsadapter.spi.WSRdbXaResourceImpl.recover(WSRdbXaResourceImpl.java:962)
    at com.ibm.ws.Transaction.JTA.XARminst.recover(XARminst.java:137)
    at com.ibm.ws.Transaction.JTA.XARecoveryData.recover(XARecoveryData.java:690)
    at com.ibm.ws.Transaction.JTA.PartnerLogTable.recover(PartnerLogTable.java:512)
    at com.ibm.ws.Transaction.JTA.RecoveryManager.resync(RecoveryManager.java:1949)
    at com.ibm.ws.Transaction.JTA.RecoveryManager.run(RecoveryManager.java:2457)
    at java.lang.Thread.run(Thread.java:832)

Solution

http://www.coderanch.com/t/414861/EJB-JEE/java/Help-XAException
http://www.ibm.com/developerworks/websphere/library/techarticles/0407_woolf/0407_woolf.html

Could not inspect JDBC autocommit mode

2010-08-26T16:39:00.000-07:00

Could not inspect JDBC autocommit mode

JPA and EJB3 Caveats - I

2010-08-26T16:37:00.000-07:00

javax.persistence.PersistenceException: [PersistenceUnit: UnitName] class or package not found

WARN [ServiceController] Problem starting service persistence.units:ear=

If you get the above warning followed by the exception in the title, check your persistence.xml, some of the entity classes maybe declared wrong (e.g. point to wrong package).

JPA/EJB 3 Setup on Eclipse

Make sure that the persistence.xml file is located in the META-INF of the EAR Project.
Having it in your JPA project does NOT automatically propogate this file to where it needs to be.

Quotes

2010-08-10T07:12:00.000-07:00

Optimist/Pessimist
The optimist live in the peninsula of infinite possibilities, where as the pessimist is stranded on an island of perpetual indecision.

Virtual Memory arguments for Eclipse

2010-05-29T11:53:00.000-07:00

On Windows:

C:\eclipse\eclipse.exe -data c:\MyWorkspace -vmargs -Xms128M -Xmx256M

Workspace location = MyWorkspace
Starting memory = 128 mb
Maximum memory = 256 mb

C++ Listing all Directories in a Folder.

2010-02-15T16:54:00.000-08:00

View the contents of a directory

This is how you get the contents of a directory in Windows with C++.

#include 
#include 

using namespace std;

int main()
{
WIN32_FIND_DATA FindFileData; 
HANDLE hFind = INVALID_HANDLE_VALUE; 
char DirSpec[MAX_PATH]; // directory specification 

cout<<"Path: ";
cin.get(DirSpec, MAX_PATH);
cout<<"\n";
strncat(DirSpec, "\\*", 3);
hFind = FindFirstFile(DirSpec, &FindFileData);

 if(hFind == INVALID_HANDLE_VALUE)
 {
 cout<<"Error: invalid path\n";
 }

cout<<<"\n";

 while(FindNextFile(hFind, &FindFileData) != 0)
 {
 cout<<<"\n";
 }

FindClose(hFind);

return 0;
}