Compiler crash with SimpleJavaFileObject

<testcase>
import java.net.URI;
import java.util.Arrays;
import javax.tools.*;
import static javax.tools.StandardLocation.*;
import static javax.tools.JavaFileObject.Kind.*;

class JFO extends SimpleJavaFileObject {
    public JFO(URI uri, JavaFileObject.Kind kind) {
        super(uri, kind);
    }
}
public class JFOTest04 {
    public static void main(String... arg) throws Exception {
        JavaCompilerTool javac = ToolProvider.getSystemJavaCompilerTool();
        JavaFileObject jfo = new JFO(new URI("JFOTest04.java"),SOURCE);
        JavaCompilerTool.CompilationTask ct = javac.getTask(null,null,null,null,
                        null, Arrays.asList(jfo));
        ct.run();
    }
}
</testcase>

<output>
bash-3.00$ java JFOTest04
An exception has occurred in the compiler (1.6.0-beta2). Please file a bug at the Java Developer Connection (http://java.sun.com/webapps/bugreport) a
fter checking the Bug Parade for duplicates. Include your program and the following diagnostic in your report. Thank you.
java.lang.UnsupportedOperationException
        at javax.tools.SimpleJavaFileObject.getCharContent(SimpleJavaFileObject.java:110)
        at com.sun.tools.javac.main.JavaCompiler.readSource(JavaCompiler.java:434)
        at com.sun.tools.javac.main.JavaCompiler.parse(JavaCompiler.java:501)
        at com.sun.tools.javac.main.JavaCompiler.parseFiles(JavaCompiler.java:733)
        at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:659)
        at com.sun.tools.javac.main.Main.compile(Main.java:327)
        at com.sun.tools.javac.api.JavacTaskImpl.run(JavacTaskImpl.java:113)
        at JFOTest04.main(JFOTest04.java:18)
</output>

<java-version>
bash-3.00$ java -version
java version "1.6.0-beta2"
Java(TM) SE Runtime Environment (build 1.6.0-beta2-b86)
Java HotSpot(TM) Client VM (build 1.6.0-beta2-b86, mixed mode)
</java-version>
failing testcase: javac/api/JavaFileObject/JFOTest04
Updated testcase
--------------------
import java.net.URI;
import java.util.Arrays;
import javax.tools.*;
import static javax.tools.JavaFileObject.Kind.*;

class JFO extends SimpleJavaFileObject {
    public JFO(URI uri, JavaFileObject.Kind kind) {
        super(uri, kind);
    }
}
public class JFOTest04 {
    public static void main(String... arg) throws Exception {
        JavaCompiler javac = ToolProvider.getSystemJavaCompiler();
        JavaFileObject jfo = new JFO(new URI("JFOTest04.java"),SOURCE);
        JavaCompiler.CompilationTask ct = javac.getTask(null,null,null,null,
                        null, Arrays.asList(jfo));
        ct.call();
    }
}
----------------------------