problem in build.xml

Question

When I gave ant myproject-war. I got the following error. can any one help plzz

BUILD FAILED
C:\Documents and Settings\personal\Desktop\project files\myproject\bu
ild.xml:167: taskdef A class needed by class org.apache.jasper.JspC cannot be fo
und: javax/servlet/ServletContext

Answer 1

Gotta add a JAR containing javax.servlet.ServletContext to your CLASSPATH.

Answer 2

Check your manifest and classpath. They might not be including the necessary jar.

For instance: classpathref="some_classpath" could go in the javac tag, where some_classpath equals

<path id="some_classpath">
 <pathelement location="${someJar.jar}"/>
 <pathelement location="${another.jar}"/>
</path>

Also, you jar's manifest should have something like:

<manifest>
    <attribute name="Class-Path" value="../lib/another.jar ../lib/someJar.jar"/>
</manifest>

Answer 3

In ant new tasks can be defined (taskdef). Some of these tasks need you to put java-libraries into the classpath of ant. That can be realized by copying the appropriate jar into the lib/ext-directory of the ant-installation.

Answer 4

You need a jar in your classpath for the target that's running JspC that contains javax.servlet.ServletContext. So, for example, if you're using Tomcat, servlet-api.jar might be the jar you're looking for. If you're doing GWT, gwt-user.jar might be the jar. Depends on your context.

Answer 5

You are using Ant tasks with dependencies not supported in the core API.

From the documentation:

Ant supports a number of optional tasks. An optional task is a task which typically requires an external library to function. The optional tasks are packaged together with the core Ant tasks.

Use the manual to locate the optional tasks and add the required dependencies to the classpath.

Answer 6

ant doesnt take spaces in classpath.