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Date: Tue, 23 Feb 2010 12:16:42 -0500
From: Rhino <rhino1@sympatico.ca>
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To: ant-user <user@ant.apache.org>
Subject: Logging problem using Ant
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Hi,

I am having an odd problem using Ant. Whenever my Java program tries to 
create a new instance of java.util.logging.FileHandler, I get a 
java.io.IOException that says "Couldn't get lock for log2\baz.log.xml".

The weird part of this problem is that I get this error when I am 
running Ant but NOT when I simply execute the program in Eclipse.

I am running Eclipse 3.5.1 Galileo on Windows XP with SP 2. This version 
of Eclipse contains Ant 1.7.1.

When I run the program from an Ant script within Eclipse OR from the 
Windows command line (using Ant 1.8.0), I get the error that I 
mentioned. However, when I run the program as a Java application from 
within Eclipse, it works fine and does not generate this error.

I'm baffled and would appreciate some help to prevent this error.

I've created a simple example and an Ant build file that illustrates the 
problem.

My project is called Logging and it is a regular Java project in 
Eclipse. Within the package com.foo.baz2, which is in my src folder in 
the Logging project, I have the following classes:

    * Supremo, which is the driver program
    * Alpha,  which is the class invoked from Supremo which actually
      writes to the log file

Here is the source code for Supremo:
================================
package com.foo.baz2;

import java.io.File;
import java.io.IOException;
import java.util.logging.FileHandler;
import java.util.logging.Handler;
import java.util.logging.Level;
import java.util.logging.Logger;


public class Supremo {
    /**
     * The name of this class.
     */
    private final String CLASS_NAME = getClass().getName();

    /**
     * The logger that will log error messages in this class.
     */
    private Logger logger = null;
   
    /**
     * The file handler used by this logger.
     */
    private Handler logFileHandler = null;
   

    /**
     * @param args
     */
    public static void main(String[] args) {
       
        new Supremo();
       
        System.out.println("=== Supremo ends ===");
    }
   
    public Supremo() {
       
        configureLogger();   
        new Alpha(logger).writeText();
    }

   /**
     * Method configureLogger() configures the logger(s) used by this 
program.
     *
     * <p>Additional comments about method configureLogger().</p>
     */
    private final void configureLogger() {

        String METHOD_NAME = "configureLogger()"; //$NON-NLS-1$
           
    /* Create the logger. */       
        this.logger = Logger.getLogger(CLASS_NAME);
       
    /* Create a file handler for the logger. */
        String logFile = "log2" + File.separator + "baz.log.xml";
        try {
            this.logFileHandler = new FileHandler(logFile);
            }
        catch (IOException io_excp) {
            System.err.println(this.CLASS_NAME + "." + METHOD_NAME + " - 
Couldn't create FileHandler for logger " + this.CLASS_NAME + " using 
file " + logFile + ". Error: " + io_excp); //$NON-NLS-1$ //$NON-NLS-2$ 
//$NON-NLS-3$ //$NON-NLS-4$
            io_excp.printStackTrace();
            return;
            }
        this.logger.addHandler(this.logFileHandler);
       
    /* Set the logging level. */   
        this.logger.setLevel(Level.FINEST);
    }

}
================================


Here is the source code for Alpha:

================================
package com.foo.baz2;

import java.util.logging.Logger;

public class Alpha {

    /**
     * The name of this class.
     */
    private final String CLASS_NAME = getClass().getName();

    /**
     * The logger that will log error messages in this class.
     */
    private Logger logger = null;
   
    public Alpha() {
        super();
    }
   
    public Alpha(Logger logger) {
        super();
        this.logger = logger;
    }
   
    public void writeText() {
       
        final String METHOD_NAME = "writeText()";
       
        System.out.println(CLASS_NAME);
        logger.entering(CLASS_NAME, METHOD_NAME);
       
    }  
}
================================


Here is the build file, which is named build2.xml:

================================
<?xml version="1.0" ?><project name="Logging" default="buildall" 
basedir=".">
<description>Compile and run the Baz program.
</description>

<property name="domain.slashes" value="com\foo" description="The domain 
name written as a path."/>
<property name="jdkbin" value="c:\Program Files\Java\jdk1.6.0_18\bin" 
description="The path to the Java JDK binaries."/>
<property name="workspace351" value="c:\eclipse\workspace" 
description="The path to the Eclipse 3.5.1 workspace."/>
<property name="baz.proj" value="Logging" description="The name of the 
Baz project."/>
<property name="baz.pkg" value="${domain.slashes}\baz2" description="The 
name of the package containing the Baz code."/>
<property name="compiler.path" value="${jdkbin}\javac" description="The 
path of the Java 1.6.0_18 compiler."/>
<property name="baz.src" value="${workspace351}\${baz.proj}\src" 
description="The path to the source files for the Baz code."/>
<property name="baz.bin" value="${workspace351}\${baz.proj}\bin" 
description="The path to the class files for the Baz code."/>
<property name="baz.output.dir" 
value="${workspace351}\${baz.proj}\output" description="The path to the 
output directory for the Baz project."/>
   

<!--==================================================================
    Establish patternsets.
    ==================================================================-->
<patternset id="ps.baz" description="The project-specific Baz code.">
    <include name="${baz.pkg}\*.*"/>
    </patternset> 
       

<!--==================================================================
   Compile all of the Java code, both project-specific and common.
    ==================================================================-->
<target name="compile" description="Compile the Java code.">
    <javac srcdir="${baz.src}" destdir="${baz.bin}" compiler="modern" 
fork="yes"
        verbose="no" debug="on" debuglevel="lines,vars,source" 
deprecation="yes"
        executable="${compiler.path}" source="1.6"
        description="Compile the code in the baz packages.">
        <classpath>
            <pathelement path="${baz.bin}"/>
            </classpath>
        <patternset refid="ps.baz"/>
        </javac>
</target>

<!--==================================================================
    Run the program via Ant.
    
==================================================================-->    
<target name="run" description="Run the program.">
   
    <echo message="Run the program."/>
    <java classname="com.foo.baz2.Supremo" fork="false"
        description="Execute the Supremo program.">
        <classpath>
            <pathelement path="${baz.bin}"/>
            </classpath>
        </java>
       
</target>

<!--==================================================================
   Do the complete build.
    ==================================================================-->
<target name="buildall" depends="compile,run" description="Tasks that 
make up a complete build.">
    <echo message="The build has ended successfully."/>
</target>
</project>
================================


Here is the output from the Ant build when it is run in Eclipse using 
Ant 1.7.1:

================================
Buildfile: C:\eclipse\workspace\Logging\xml\build2.xml
compile:
run:
     [echo] Run the program.
     [java] com.foo.baz2.Supremo.configureLogger() - Couldn't create 
FileHandler for logger com.foo.baz2.Supremo using file log2\baz.log.xml. 
Error: java.io.IOException: Couldn't get lock for log2\baz.log.xml
     [java] java.io.IOException: Couldn't get lock for log2\baz.log.xml
     [java]     at java.util.logging.FileHandler.openFiles(Unknown Source)
     [java]     at java.util.logging.FileHandler.<init>(Unknown Source)
     [java]     at com.foo.baz2.Supremo.configureLogger(Supremo.java:61)
     [java]     at com.foo.baz2.Supremo.<init>(Supremo.java:40)
     [java]     at com.foo.baz2.Supremo.main(Supremo.java:33)
     [java]     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native 
Method)
     [java]     at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown 
Source)
     [java]     at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
     [java]     at java.lang.reflect.Method.invoke(Unknown Source)
     [java]     at 
org.apache.tools.ant.taskdefs.ExecuteJava.run(ExecuteJava.java:217)
     [java]     at 
org.apache.tools.ant.taskdefs.ExecuteJava.execute(ExecuteJava.java:152)
     [java]     at org.apache.tools.ant.taskdefs.Java.run(Java.java:764)
     [java]     at 
org.apache.tools.ant.taskdefs.Java.executeJava(Java.java:218)
     [java]     at 
org.apache.tools.ant.taskdefs.Java.executeJava(Java.java:132)
     [java]     at org.apache.tools.ant.taskdefs.Java.execute(Java.java:105)
     [java]     at 
org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)
     [java]     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native 
Method)
     [java]     at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown 
Source)
     [java]     at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
     [java]     at java.lang.reflect.Method.invoke(Unknown Source)
     [java]     at 
org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
     [java]     at org.apache.tools.ant.Task.perform(Task.java:348)
     [java]     at org.apache.tools.ant.Target.execute(Target.java:357)
     [java]     at org.apache.tools.ant.Target.performTasks(Target.java:385)
     [java]     at 
org.apache.tools.ant.Project.executeSortedTargets(Project.java:1337)
     [java]     at 
org.apache.tools.ant.Project.executeTarget(Project.java:1306)
     [java]     at 
org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
     [java]     at 
org.eclipse.ant.internal.ui.antsupport.EclipseDefaultExecutor.executeTargets(EclipseDefaultExecutor.java:32)
     [java]     at 
org.apache.tools.ant.Project.executeTargets(Project.java:1189)
     [java]     at 
org.eclipse.ant.internal.ui.antsupport.InternalAntRunner.run(InternalAntRunner.java:423)
     [java]     at 
org.eclipse.ant.internal.ui.antsupport.InternalAntRunner.main(InternalAntRunner.java:137)
     [java] com.foo.baz2.Alpha
     [java] com.foo.baz2.Beta
     [java] com.foo.baz2.Gamma
     [java] === Supremo ends ===
buildall:
     [echo] The build has ended successfully.
BUILD SUCCESSFUL
Total time: 313 milliseconds

================================

Does anyone know why I'm having this problem?

--
Rhino

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