SAXParser, Classpath woes and ANT

Greetings,
I am having a problem running a java task in ANT due to classpath related issues (I believe) but I don't understand why or how to fix them.
First to give some information I am using ant 1.7.1. I do NOT have an enviroment variable classpath.
I have not had any issues until a new task I created today which is failing. The program in question needs to use a SAXParser and is failing like below...
[java] Warning: Caught exception attempting to use SAX to load a SAX XMLRea
der
[java] Warning: Exception was: java.lang.ClassNotFoundException: org.apache
.xerces.parsers.SAXParserSo Google would lend me to believe this is a classpath error. Okay. But I don't really get how, why or most how to fix it. Here is what I know so far.
- I haven't had problems with other java tasks before now. And other tasks that have run before still run fine today
- I do not have a classpath environment variable.
- I can run the program from Eclipse with the same included libraries
- I munged all the classpath elements into one classpath atrribute for the task. It still does not work but if I copy and paste this exact path into java -cp CLASSPATHPASTEDHERE ClassName then it does work.
I don't know what to look at next. All the elements of the classpath exist and are correctly named, it runs stand-alone but not in ANT. Any suggestions appreciated.

ant -d produced 30 odd K of output it didn't tell me anything particularly exciting although ant was trying to use the parent class loader rather than the ant class loader to load it. If that means something to you I don't know.That just means to me something along the lines of "there's something going on with the parser class being visible by which class loader, reminding that JAXP may use the contextClassLoader at some point"... Not a very accurate thought I know, but the class loading traces are probably necessary to go further into the explanation.
I was hoping the -d traces would give the whole stack trace for the ClassNotFoundException. The problem is probably explainable by JAXP's dynamic loading of the parser class(ses), but I'm not brave enough to try to understand the JDK source code by second-guessing which method might be used in both your scenarios.
Something happens in ANT that causes the parser factory to do something different. When I run the java command myself with verbose I see this.
Loaded com.sun.org.apache.xerces.internal.parsers.SAXParser from C:\Program Files\Java\jre6\lib\rt.jar
So. Um. It's using a different parser (different classname). I don't really understand why.By a quick look at javax.xml.parsers.SAXParserFactory Javadoc:
- unless the class name is specified, JAXP will look for class whose names are:
1) specified in a system property javax.xml.parsers.SAXParserFactory
2) failing that, specified in the JRE config file
3) failing that, specified a s a service
4) failing that, default to "platform default"
A quick look at the code additionally shows that:
- 4) is com.sun.org.apache.xerces.internal.parsers.SAXParser in Sun's JRE6
- the config file mentioned at step 2) is read only once (see note below)
- under some circumstances, which I didn't get well, 4) is not attempted
- the context class loader plays a role that I didn't dig, I think it's specifically for 3)
Please note, if you really want to understand what was going on, that the SAXParserFactory Javadoc also mentions:
Tip for Trouble-shooting
Setting the jaxp.debug system property will cause this method to print a lot of debug messages to System.err about what it is doing and where it is looking at.
If you have problems loading DocumentBuilders, try:
+java -Djaxp.debug=1 YourProgram ....+
(+note+) just noted by the way that there's a horrible Double-Checked Locking idiom (DCL) in the caching of the properties file!
Edited by: jduprez on Oct 7, 2009 1:02 PM

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Revision: 758
Author: [email protected]
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Log Message:
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           windowtitle="jga: Java Generic Algorithms">
    <doctitle><![CDATA[<h1>jga: Generic Algorithms for Java</h1>]]></doctitle>
    <bottom><![CDATA[<i>Copyright � 2002-2005 David A. Hall. All Rights Reserved.</i>]]>
    </bottom>
    <classpath>
      <pathelement path="${jnlp.api}"/>
      <path refid="project.classpath"/>
    </classpath>
    <doclet name="tools.ExcludeDoclet" path=".">
        <param name="-excludefile" value="visitors.txt"/>
     </doclet>
   </javadoc>
<jar jarfile="${javadocjar}" basedir="${javadocdir}"/>
</target>I've also tried the form where the doclet information is passed as attributes of the javadoc tag, and I've tried skipping ant by building a shell script with the same collection of arguments. In all cases, I get output indicating that the ExcludeDoclet has successfully read the file, processed the list of classes in the indicated packages, and removed those from the visitors.txt file. It appears, however, that once the excluded list of source files has been procesed, javadoc exits without processing the remaining files.
javadoc:
   [delete] Deleting directory /home/dave/projects/jga/doc/javadoc
   [delete] Deleting directory /home/dave/projects/jga/doc/javadoc
    [mkdir] Created dir: /home/dave/projects/jga/doc/javadoc
[javadoc] Generating Javadoc
[javadoc] Executing '/opt/jdk1.5.0/bin/javadoc' with arguments:
[javadoc] '-d'
[javadoc] '/home/dave/projects/jga/doc/javadoc'
[javadoc] '-overview'
[javadoc] '/home/dave/projects/jga/src/overview.html'
[javadoc] '-windowtitle'
[javadoc] 'jga: Java Generic Algorithms'
[javadoc] '-doctitle'
[javadoc] '<h1>jga: Generic Algorithms for Java</h1>'
[javadoc] '-bottom'
[javadoc] '<i>Copyright � 2002-2005 David A. Hall. All Rights Reserved.</i>
[javadoc]     '
[javadoc] '-classpath'
[javadoc] '/opt/jdk1.5.0/sample/jnlp/servlet/jnlp.jar:...'
[javadoc] '-sourcepath'
[javadoc] '/home/dave/projects/jga/src:/home/dave/projects/jga/build/src'
[javadoc] '-doclet'
[javadoc] 'tools.ExcludeDoclet'
[javadoc] '-docletpath'
[javadoc] '/home/dave/projects/jga:/opt/ant/lib/ant-launcher.jar:...'
[javadoc] '-excludefile'
[javadoc] 'visitors.txt'
[javadoc] '-source'
[javadoc] '1.5'
[javadoc] 'net.sf.jga.fn'
[javadoc] 'net.sf.jga.util'
[javadoc] 'net.sf.jga.parser'
[javadoc]
[javadoc] The ' characters around the executable and arguments are
[javadoc] not part of the command.
[javadoc] Javadoc execution
[javadoc] Loading source files for package net.sf.jga.fn...
[javadoc] Loading source files for package net.sf.jga.util...
[javadoc] Loading source files for package net.sf.jga.parser...
[javadoc] Constructing Javadoc information...
[javadoc] Removing excluded source files.......
[javadoc] Excluding net.sf.jga.fn.adaptor.OrBinary.Visitor
[javadoc] Excluding net.sf.jga.fn.adaptor.OrUnary.Visitor
[javadoc] Excluding net.sf.jga.fn.string.DefaultFormat.Visitor
[javadoc] Excluding net.sf.jga.fn.string.Match.VisitorDoes anyone have any ideas how I can get this to work?
Dave Hall
http://jga.sf.net/
http://jroller.com/page/dhall/

I'd read Ant's documentation as being able to
include/exclude whole packages, but not individual
classes within packages: I may have read it this was
because I expect that ant is simply assembling the
command line arguments that it'll pass to javadoc.
My expectation was that if there is no way for
javadoc proper to exclude individual classes, that
there would be no way for ant to do it either.Taken straight from the documentation of the Javadoc task in the ANT Manual:
Parameters specified as nested elements
fileset
A FileSet. All matched files will be passed to javadoc as source files. Ant will automatically add the include pattern **/*.java to these filesets.
Nested filesets can be used to document sources that are in the default package or if you want to exclude certain files from documentation. If you want to document all source files and don't use the default package, packagesets should be used instead as this increases javadocs performance.
The packagenames, excludepackagenames and defaultexcludes attributes of the task have no effect on the nested <fileset> elements.
... <javadoc
           destdir="docs/api"
           author="true"
           version="true"
           use="true"
           windowtitle="Test API">
    <fileset dir="src" defaultexcludes="yes">
      <include name="com/dummy/test/**" />
      <exclude name="com/dummy/test/doc-files/**"/>
    </fileset>
    <doctitle><![CDATA[<h1>Test</h1>]]></doctitle>
    <bottom><![CDATA[<i>Copyright � 2000 Dummy Corp. All Rights Reserved.</i>]]></bottom>
    <tag name="todo" scope="all" description="To do:" />
    <group title="Group 1 Packages" packages="com.dummy.test.a*"/>
    <group title="Group 2 Packages" packages="com.dummy.test.b*:com.dummy.test.c*"/>
    <link offline="true" href="http://java.sun.com/products/jdk/1.2/docs/api/" packagelistLoc="C:\tmp"/>
    <link href="http://developer.java.sun.com/developer/products/xml/docs/api/"/>
</javadoc>Although this example illustrates how to exclude whole directories, this technique works for files, too.
How hard would it be to turn ExcludeDoclet into
something that could be passed to javadoc on the
command line?I don't think that is possible.
IMHO, there are 3 options you might want to investigate:
1. Use the fileset parameter of ANT's Javadoc task to exclude files by name.
2. Use ANT's Java task to run ExcludeDoclet as an application from within ANT.
3. Try yDoc (a commercial Javadoc enhancement that allows you to define custom filter criteria) http://www.yworks.com/products/ydoc/Each of these options has its drawbacks:
Suppose there are multiple classes defined in one source file (visible nested classes count, too), then you have to specify all these classes in the excludefile for ExcludeDoclet to actually exclude that file from documentation (it's either all or nothing for any given source file).
Since the fileset parameter of ANT's Javadoc task is - well - file based, it will always exclude all classes in a given source file from documentation, so ExcludeDoclet's behavior might be preferable in a "better too much than too less documentation" way, but both lack, IMHO.
yDoc actually allows you to exclude on a documentation element basis - although it does a poor job when handling references (i.e. hyperlinks) to the excluded elements.

Weblogic.rmic and ant integration issue

I am trying to call weblogic.rmic compiler through a ant script and was
sucessful in doing so and generating the stubs and skelton for my RMI
implementation.
But i also want to pass a system property value (in the example i am passing
file=stdout using -D to java) to weblogic.rmi compiler and don't know how to
do that.
Any help will be greatly appreciated...
Thanks
Kunjan Jhaveri
781-372-3965
[email protected]
PS: Script enclosed.
<target name="local.genStubs" depends="local.compile">
<java classname="weblogic.rmic" fork="yes" failonerror="yes">
<jvmarg value="-Dfile=stdout" />
<arg value="-classpath" />
<arg value="${WL_HOME}${file.separator}lib${file.separator}weblogic.jar" />
<arg value="-d" />
<arg value="${SRCDIR}${file.separator}build${file.separator}classes" />
<arg value="com.ehealthdirect.ee.kernel.EEMutexManagerImpl" />
<classpath>
<pathelement
path="${WL_HOME}${file.separator}lib${file.separator}weblogic.jar" />
</classpath>
</java>
</target>

As far as I know, rmic doesn't know anything about a "file" system property. Is
there some reason you expect this to do something special?
Kunjan Jhaveri wrote:
I am trying to call weblogic.rmic compiler through a ant script and was
sucessful in doing so and generating the stubs and skelton for my RMI
implementation.
But i also want to pass a system property value (in the example i am passing
file=stdout using -D to java) to weblogic.rmi compiler and don't know how to
do that.
Any help will be greatly appreciated...
Thanks
Kunjan Jhaveri
781-372-3965
[email protected]
PS: Script enclosed.
<target name="local.genStubs" depends="local.compile">
<java classname="weblogic.rmic" fork="yes" failonerror="yes">
<jvmarg value="-Dfile=stdout" />
<arg value="-classpath" />
<arg value="${WL_HOME}${file.separator}lib${file.separator}weblogic.jar" />
<arg value="-d" />
<arg value="${SRCDIR}${file.separator}build${file.separator}classes" />
<arg value="com.ehealthdirect.ee.kernel.EEMutexManagerImpl" />
<classpath>
<pathelement
path="${WL_HOME}${file.separator}lib${file.separator}weblogic.jar" />
</classpath>
</java>
</target>

JUnit and Ant, ClassNotFound

hi,
I'm trying to let ant run a batch of JUnitCase's but I keep bumping in to strange problems: This is the script:<target name="junit">
<junit printsummary="yes" haltonfailure="yes">
    <classpath>
      <pathelement location="V:\Workspace\Build\bin"/>
      <pathelement path="${java.class.path}"/>
    </classpath>
    <test name="calypsox.build.test.UtilTest"/>//This one works so obviously the classpath is ok
    <batchtest todir="v:\temp">
      <formatter type="brief"/>
     <fileset dir="V:\Workspace\Build\calypsox\build\test">
       <include name="**/*Test*.java"/>
     </fileset>
    </batchtest>
</junit>
</target>The single Test is performed ok, no problems, the batch-test however gives a srange error:
Testsuite: UtilTest
Tests run: 1, Failures: 0, Errors: 1, Time elapsed: 0 sec
Null Test:      Caused an ERROR
UtilTest
java.lang.ClassNotFoundException: UtilTest
In the folder 'V:\Workspace\Build\calypsox\build\test' there is only 1 TestCase (for the moment): UtilTest.java. Obviously (from the error), the file is found and executed (It WAS a null-test) but gives an error stating that it can't find the class?
Any ideas?
tx,
Stijn

<project name="UtilTest" default="UtilTest" basedir=".">
<target name="UtilTest">
    <javac srcdir="."
            destdir="."
            defaultexcludes="no"
            includes="UtilTest.java"
            classpath="${java.class.path}"
            target="1.4"
            extdirs=""
         />
</target>
</project>I'm going to be honest, I'm not familiar with xml style you are using for your compilation. I'm assuming that the xml you are listing above is from your "build.xml" file?
Above is a sample of a "build.xml" that I might use for the compilation. I'm not saying that my way is the best way, or even the only way, but it works for me.

Javelin and Ant trouble

Hi All,
I'm trying to run Ant with the generated Ant build file (Controls application). And when I run Ant I've got this output :
Buildfile: build.xml
check-jar:
[echo] Controls.jar is not up-to-date. Running build
build:
[delete] Deleting directory C:\DOCUME~1\lacaes\LOCALS~1\Temp\wlw-temp-6760\wlw_compile6557
[mkdir] Created dir: C:\DOCUME~1\lacaes\LOCALS~1\Temp\wlw-temp-6760\wlw_compile6557
[javelin] Errors found in csf\fr\edi\exceptions\ExceptionDataBase.jcx:
[javelin] Error at line 54 column 10:
[javelin] void insertionErreur(final ImpErrRow errRow);
[javelin] <------------->
[javelin] Description: Validation class for this value was not provided or was not found.
[javelin] Prescription: Verify that the validation class for this type is available.
[javelin] Error at line 54 column 10:
[javelin] void insertionErreur(final ImpErrRow errRow);
etc.....
Some topics talks about this problem but I never saw a response. When I run setDomainEnv.cmd before Ant everything works fine: so I sure it's a classpath problem but I don't see which one ?
Thx for help :)

Hi
Which version of 8.1 are you using? You should not see the issue on the latest 8.1sp6
We have seen such issue on 8.1sp2 when you use jdk1.4.2.
There is a patch available on 8.1sp2 for the issue via CR139151. Please open a bea support case at http://bea.support.com if you need the patch.
Vimala-

SAXParser, Classpath woes and ANT

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