How to make a Build.xml in Eclipse ?

Making a Build.xml in eclipse is very easy and it can be done in just a few button clicks.

After you have made the project and kept all the source files in the src folder do the following steps to make a build.xml .

• Right click on the Project folder and click on Export.
• Click on General which has a option Ant Buildfiles.
• Click next and select the project for which you have to make a Build.xml .
• This will create the Build.xml.

Now if you want to clean or build the project do the following steps:

• Right Click on the the Build.xml file and click on Run As.
• Click the Ant Build.. option which will take you to Edit configuration and launch.
• You can select target to execute.

Video Reference : https://eclipse-tutorial.dev.java.net/visual-tutorials/generatingantbuildfile.html

Windows cannot find '-Dsun.io.useCanonCahes=false'

Windows cannot find '-Dsun.io.useCanonCahes=false'. Make sure you typed the name correctly, and then try again. To search for a file , click the Start button, and then click search.

If you have the following error while you are trying to start the Apache Tomcat server ( My case it was Apache-Tomcat-4.1.37 ). Then you don't have the JAVA_HOME correctly added to the environment variable.

• Right click on My Computer and click on properties.
• Go to the Advanced tab and click Environment Variables.
• Add a new entry to the system variables if the JAVA_HOME does not exists.
• Set the variable value pointing to the place where it is installed.

To compile any of the .java file you can open the command prompt and type

javac classname.java

This will create the classname.class file .

But if the path to the javac compiler is not set the nit will give the following error message although the JAVA_HOME is set:

"'javac' is not recognized as an internal or external command, operable program or batch file."

To rectify the problem add the path of the javac to the path in the Environment variables.

C:\j2sdk1.4.2_18\bin

The other work around to this problem is each time specify the path like:

C:\j2sdk1.4.2_01\bin\javac classname.java

But setting the environment variables is better option.