JavaCompilerTool.CompilationTask.getDiagnostics() will throw java.lang.IllegalArgumentException
<code>
import java.io.File;
import java.io.PrintWriter;
import javax.tools.*;
import static javax.tools.JavaFileObject.Kind.*;

class Foo {
    public static void main(String[] args) throws Exception {
        JavaCompilerTool compiler = ToolProvider.defaultJavaCompiler();
        JavaFileManager jfm = ToolProvider.defaultJavaCompiler().getStandardFileManager();
        //jfm = compiler.getStandardFileManager();
        JavaFileObject jfo = jfm.getFileForInput("Test13.jar");
        compiler.run((PrintWriter)null, jfo).getDiagnostics();
    }
}
<\code>
Test13.jar have Foo.java but I observed this bug with any kind of jar file.
output of the code:
<output>
E:\javatrails\compilerAPI>javac Test24.java

E:\javatrails\compilerAPI>java Test24
An exception has occurred in the compiler (1.6.0-auto). Please file a bug at the Java Developer Connection (http://java.
sun.com/webapps/bugreport) after checking the Bug Parade for duplicates. Include your program and the following diagnos
tic in your report. Thank you.
java.lang.IllegalArgumentException
        at com.sun.tools.javac.util.Diagnostic.<init>(Diagnostic.java:274)
        at com.sun.tools.javac.util.Diagnostic$Factory.warning(Diagnostic.java:97)
        at com.sun.tools.javac.util.Log.warning(Log.java:420)
        at com.sun.tools.javac.util.DefaultFileManager.decode(DefaultFileManager.java:610)
        at com.sun.tools.javac.util.DefaultFileManager.access$300(DefaultFileManager.java:54)
        at com.sun.tools.javac.util.DefaultFileManager$RegularFileObject.getCharContent(DefaultFileManager.java:744)
        at com.sun.tools.javac.util.DefaultFileManager$RegularFileObject.getCharContent(DefaultFileManager.java:637)
        at com.sun.tools.javac.main.JavaCompiler.readSource(JavaCompiler.java:416)
        at com.sun.tools.javac.main.JavaCompiler.parse(JavaCompiler.java:480)
        at com.sun.tools.javac.main.JavaCompiler.parseFiles(JavaCompiler.java:697)
        at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:629)
        at com.sun.tools.javac.main.Main.compile(Main.java:756)
        at com.sun.tools.javac.api.JavacTaskImpl.run(JavacTaskImpl.java:82)
        at com.sun.tools.javac.api.JavacTaskImpl.getDiagnostics(JavacTaskImpl.java:99)
        at com.sun.tools.javac.api.JavacTaskImpl.getDiagnostics(JavacTaskImpl.java:47)
        at Test24.compile(Test24.java:14)
        at Test24.main(Test24.java:18)
<\output>

<java-version>
java version "1.6.0-auto"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.6.0-auto-294)
Java HotSpot(TM) Client VM (build 1.6.0-ea-b57, mixed mode)
<\java-version>