ANT error CreateProcess error=2 - ant

Question

When I try to call simple JAR file via ANT. Whenever i execute I get the following error:
C:\temp\My\My_Ant.xml:20: Execute failed: java.io.IOException: Cannot run program "C:\PROGRA~1\Java\jre7\bin\java.exe -jar C:\temp\My\javatest.jar" (in directory "C:\temp\My"): CreateProcess error=2, The system cannot find the file specified
at java.lang.ProcessBuilder.start(ProcessBuilder.java:1047)
at java.lang.Runtime.exec(Runtime.java:617)
at org.apache.tools.ant.taskdefs.launcher.Java13CommandLauncher.exec(Java13CommandLauncher.java:58)
at org.apache.tools.ant.taskdefs.Execute.launch(Execute.java:426)
at org.apache.tools.ant.taskdefs.Execute.execute(Execute.java:440)
at org.apache.tools.ant.taskdefs.ExecTask.runExecute(ExecTask.java:629)
at org.apache.tools.ant.taskdefs.ExecTask.runExec(ExecTask.java:670)
at org.apache.tools.ant.taskdefs.ExecTask.execute(ExecTask.java:496)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:293)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
at org.apache.tools.ant.Task.perform(Task.java:348)
at org.apache.tools.ant.Target.execute(Target.java:435)
at org.apache.tools.ant.Target.performTasks(Target.java:456)
at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1405)
at org.apache.tools.ant.Project.executeTarget(Project.java:1376)
at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
at org.apache.tools.ant.Project.executeTargets(Project.java:1260)
at org.apache.tools.ant.Main.runBuild(Main.java:854)
at org.apache.tools.ant.Main.startAnt(Main.java:236)
at org.apache.tools.ant.launch.Launcher.run(Launcher.java:285)
at org.apache.tools.ant.launch.Launcher.main(Launcher.java:112)
Caused by: java.io.IOException: CreateProcess error=2, The system cannot find the file specified
at java.lang.ProcessImpl.create(Native Method)
at java.lang.ProcessImpl.(ProcessImpl.java:385)
at java.lang.ProcessImpl.start(ProcessImpl.java:136)
at java.lang.ProcessBuilder.start(ProcessBuilder.java:1028)
... 24 more
The Java program is simply printing "hello world!"
I call the ANT in the following way:
C:\Tools\ANT\apache-ant-1.9.7\bin\ant -buildfile My_Ant.xml
Any idea why I am getting this? when I run this via command line I get the correct message.
C:\temp\My>C:\PROGRA~1\Java\jre7\bin\java.exe -jar JavaTest.jar
hello from Java
Edit:
Ant Script:
<?xml version="1.0" encoding="UTF-8"?>
<project name="Issue Management" default="startActivity" xmlns:if="ant:if" xmlns:unless="ant:unless">
<property name="javaPath" value="C:\PROGRA~1\Java\jre7\bin\java.exe"/>
<property name="AnalyzerPath" value="C:\temp\my"/>
<property name="Analyzer" value="javatest.jar"/>
<!--Setting the location of ANT Contrib starts
<taskdef resource="net/sf/antcontrib/antlib.xml">
<classpath>
<pathelement location="C:/Tools/ANT/apache-ant-1.8.2/ant-contrib-1.0b3.jar" />
</classpath>
</taskdef>-->
<tstamp>
<format property="current.time" pattern="yyyyMMdd_HHmmss" />
</tstamp>
<target name="startActivity">
<echo>Issue Management script started at ${current.time}</echo>
<exec executable="${javaPath} -jar ${AnalyzerPath}\${Analyzer}" resultproperty="BuildErrorCode" failonerror="true" dir="${AnalyzerPath}">
<arg value="--help"/>
</exec>
<echo>Issue Management script ended at ${current.time}</echo>
</target>
</project>

Answer 1

The executable parameter needs to be set to the name or path of just the executable; command arguments should be specified separately using nested <arg> elements, for example:
<exec executable="${javaPath}" resultproperty="BuildErrorCode"
failonerror="true" dir="${AnalyzerPath}">
<arg value="-jar" />
<arg value="${AnalyzerPath}\${Analyzer}" />
<arg value="--help" />
</exec>
When you specified the whole command line as the executable, it was treated as a single command with embedded spaces, and so was not found:
Cannot run program "C:\PROGRA~1\Java\jre7\bin\java.exe -jar C:\temp\My\javatest.jar"
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^