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POJava Web Start - Ignoring/changing Jar href URL's
 

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  1. POJava Web Start - Ignoring/changing Jar href URL's
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    <p>I have a JNLP file which is created via a PHP script. It outputs something like the following file:</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8" standalone="no"?&gt; &lt;jnlp codebase="/" spec="1.0+"&gt; &lt;information&gt; &lt;title&gt;sometitle&lt;/title&gt; &lt;vendor&gt;somevendor&lt;/vendor&gt; &lt;homepage href=""/&gt; &lt;description&gt;somedesc&lt;/description&gt; &lt;description kind="short"&gt;someshort&lt;/description&gt; &lt;/information&gt; &lt;update check="always"/&gt; &lt;security&gt; &lt;all-permissions/&gt; &lt;/security&gt; &lt;resources&gt; &lt;j2se version="1.7+"/&gt; &lt;jar href="http://fproject.localhost/getjava/jar/e43e034c49c4a24f2711d385370faaf1ef92ca76" main="true"/&gt; &lt;jar href="http://fproject.localhost/getjava/libs/lib/commons-codec-1.6.jar" main="true"/&gt; &lt;jar href="http://fproject.localhost/getjava/libs/lib/commons-logging-1.1.1.jar" main="true"/&gt; &lt;jar href="http://fproject.localhost/getjava/libs/lib/fluent-hc-4.2.3.jar" main="true"/&gt; &lt;jar href="http://fproject.localhost/getjava/libs/lib/httpclient-4.2.3.jar" main="true"/&gt; &lt;jar href="http://fproject.localhost/getjava/libs/lib/httpclient-cache-4.2.3.jar" main="true"/&gt; &lt;jar href="http://fproject.localhost/getjava/libs/lib/httpcore-4.2.2.jar" main="true"/&gt; &lt;jar href="http://fproject.localhost/getjava/libs/lib/httpmime-4.2.3.jar" main="true"/&gt; &lt;/resources&gt; &lt;application-desc main-class="Windows8.Windows8GUI"&gt; &lt;/application-desc&gt; &lt;/jnlp&gt; </code></pre> <p>The application loads and initially opens fine, however the application is slow and unresponsive, after taking a look at my apache access log there seems to be some strange happenings, well first of all, it loads all the jars successfully: </p> <pre><code>127.0.0.1 - - [22/Feb/2013:19:39:56 +0000] "GET /getjava/libs/lib/fluent-hc-4.2.3.jar HTTP/1.1" 200 24509 "-" "JNLP/1.7.0 javaws/10.13.2.20 (&lt;internal&gt;) Java/1.7.0_13" 127.0.0.1 - - [22/Feb/2013:19:39:56 +0000] "GET /getjava/libs/lib/commons-logging-1.1.1.jar HTTP/1.1" 200 65294 "-" "JNLP/1.7.0 javaws/10.13.2.20 (&lt;internal&gt;) Java/1.7.0_13" 127.0.0.1 - - [22/Feb/2013:19:39:56 +0000] "GET /getjava/jar/ba1df5097852421a791d095271fd48df6c79804c HTTP/1.1" 200 14060 "-" "JNLP/1.7.0 javaws/10.13.2.20 (&lt;internal&gt;) Java/1.7.0_13" 127.0.0.1 - - [22/Feb/2013:19:39:56 +0000] "GET /getjava/libs/lib/commons-codec-1.6.jar HTTP/1.1" 200 253503 "-" "JNLP/1.7.0 javaws/10.13.2.20 (&lt;internal&gt;) Java/1.7.0_13" 127.0.0.1 - - [22/Feb/2013:19:39:57 +0000] "GET /getjava/libs/lib/httpclient-4.2.3.jar HTTP/1.1" 200 469073 "-" "JNLP/1.7.0 javaws/10.13.2.20 (&lt;internal&gt;) Java/1.7.0_13" 127.0.0.1 - - [22/Feb/2013:19:39:57 +0000] "GET /getjava/libs/lib/httpclient-cache-4.2.3.jar HTTP/1.1" 200 124242 "-" "JNLP/1.7.0 javaws/10.13.2.20 (&lt;internal&gt;) Java/1.7.0_13" 127.0.0.1 - - [22/Feb/2013:19:39:57 +0000] "GET /getjava/libs/lib/httpcore-4.2.2.jar HTTP/1.1" 200 245191 "-" "JNLP/1.7.0 javaws/10.13.2.20 (&lt;internal&gt;) Java/1.7.0_13" 127.0.0.1 - - [22/Feb/2013:19:39:57 +0000] "GET /getjava/libs/lib/httpmime-4.2.3.jar HTTP/1.1" 200 29955 "-" "JNLP/1.7.0 javaws/10.13.2.20 (&lt;internal&gt;) Java/1.7.0_13" </code></pre> <p>Then there are loads of requests for the same files but the location has changed:</p> <pre><code>127.0.0.1 - - [22/Feb/2013:19:40:02 +0000] "GET /getjava/jar/lib/fluent-hc-4.2.3.jar HTTP/1.1" 404 2011 "-" "Java/1.7.0_13" 127.0.0.1 - - [22/Feb/2013:19:40:03 +0000] "GET /getjava/jar/lib/httpclient-4.2.3.jar HTTP/1.1" 404 2011 "-" "Java/1.7.0_13" 127.0.0.1 - - [22/Feb/2013:19:40:03 +0000] "GET /getjava/jar/lib/httpclient-cache-4.2.3.jar HTTP/1.1" 404 2011 "-" "Java/1.7.0_13" 127.0.0.1 - - [22/Feb/2013:19:40:03 +0000] "GET /getjava/jar/lib/httpclient-4.2.3.jar HTTP/1.1" 404 2011 "-" "Java/1.7.0_13" 127.0.0.1 - - [22/Feb/2013:19:40:03 +0000] "GET /getjava/jar/lib/httpclient-4.2.3.jar HTTP/1.1" 404 2011 "-" "Java/1.7.0_13" 127.0.0.1 - - [22/Feb/2013:19:40:04 +0000] "GET /getjava/jar/lib/fluent-hc-4.2.3.jar HTTP/1.1" 404 2011 "-" "Java/1.7.0_13" 127.0.0.1 - - [22/Feb/2013:19:40:04 +0000] "GET /getjava/jar/lib/httpclient-4.2.3.jar HTTP/1.1" 404 2011 "-" "Java/1.7.0_13" 127.0.0.1 - - [22/Feb/2013:19:40:05 +0000] "GET /getjava/jar/lib/httpclient-cache-4.2.3.jar HTTP/1.1" 404 2011 "-" "Java/1.7.0_13" 127.0.0.1 - - [22/Feb/2013:19:40:05 +0000] "GET /getjava/jar/lib/httpcore-4.2.2.jar HTTP/1.1" 404 2011 "-" "Java/1.7.0_13" 127.0.0.1 - - [22/Feb/2013:19:40:05 +0000] "GET /getjava/jar/lib/httpmime-4.2.3.jar HTTP/1.1" 404 2011 "-" "Java/1.7.0_13" 127.0.0.1 - - [22/Feb/2013:19:40:06 +0000] "GET /getjava/libs/lib/httpclient-cache-4.2.3.jar HTTP/1.1" 200 124242 "-" "JNLP/1.7.0 javaws/10.13.2.20 (&lt;internal&gt;) Java/1.7.0_13" 127.0.0.1 - - [22/Feb/2013:19:40:06 +0000] "GET /getjava/libs/lib/httpcore-4.2.2.jar HTTP/1.1" 200 245191 "-" "JNLP/1.7.0 javaws/10.13.2.20 (&lt;internal&gt;) Java/1.7.0_13" 127.0.0.1 - - [22/Feb/2013:19:40:06 +0000] "GET /getjava/jar/lib/fluent-hc-4.2.3.jar HTTP/1.1" 404 2011 "-" "Java/1.7.0_13" 127.0.0.1 - - [22/Feb/2013:19:40:06 +0000] "GET /getjava/jar/lib/httpclient-4.2.3.jar HTTP/1.1" 404 2011 "-" "Java/1.7.0_13" 127.0.0.1 - - [22/Feb/2013:19:40:07 +0000] "GET /getjava/jar/lib/httpclient-cache-4.2.3.jar HTTP/1.1" 404 2011 "-" "Java/1.7.0_13" 127.0.0.1 - - [22/Feb/2013:19:40:07 +0000] "GET /getjava/jar/lib/httpcore-4.2.2.jar HTTP/1.1" 404 2011 "-" "Java/1.7.0_13" 127.0.0.1 - - [22/Feb/2013:19:40:07 +0000] "GET /getjava/jar/lib/httpmime-4.2.3.jar HTTP/1.1" 404 2011 "-" "Java/1.7.0_13" 127.0.0.1 - - [22/Feb/2013:19:40:08 +0000] "GET /getjava/jar/lib/fluent-hc-4.2.3.jar HTTP/1.1" 404 2011 "-" "Java/1.7.0_13" 127.0.0.1 - - [22/Feb/2013:19:40:08 +0000] "GET /getjava/jar/lib/httpclient-4.2.3.jar HTTP/1.1" 404 2011 "-" "Java/1.7.0_13" </code></pre> <p>Notice that /getjava/libs/lib has changed to /getjava/jar/lib</p> <p>How is this so? Where is the JVM getting this URL from?</p> <p>And more so, why does the JVM request the same file over and over again?</p> <p><strong>Edit - More information</strong></p> <p>I think I've narrowed the problem down a little bit. I'm pretty sure it's to do with Netbeans. I'm using version 7.2.1.</p> <p>It seems that the URLS for the extra library requests are coming from the <code>META-INF/MANIFEST.MF</code> file in the main application Jar. In there I can see the following: </p> <pre><code>Class-Path: lib/commons-codec-1.6.jar lib/commons-logging-1.1.1.jar li b/fluent-hc-4.2.3.jar lib/httpclient-4.2.3.jar lib/httpclient-cache-4 .2.3.jar lib/httpcore-4.2.2.jar lib/httpmime-4.2.3.jar </code></pre> <p>This would explain the modified URL's and the subsequent 404 responses as these files are not available at that URL.</p> <p>I don't understand why Netbeans is creating this paths of files. I am under the impression that Java Webstart downloads its resources using the JNLP file, and with in that the <code>&lt;resources&gt;</code> node?</p> <p>How can I stop netbeans adding this <code>Class-Path</code> attribute as I believe this is the root of my problem.</p> <p><strong>Further Updates</strong></p> <p>I have found a work around to this problem through hacking through files. If I take out this line: </p> <pre><code>&lt;attribute name="Class-Path" value="${jar.classpath}"/&gt; </code></pre> <p>from this file: </p> <pre><code>nbproject\build-impl.xml </code></pre> <p>Then Netbeans compiles the Jar correctly for a Webstart App. It does not create the <code>Class-Path</code> atttribute in the <code>META-INF/MANIFEST.MF</code> file inside the Jar. After removing this the app works absolutely fine, no hangs and no bogus requests for files which do not exist.</p> <p>Now I guess the question is, why does Netbeans do this? And is there a proper work around rather than me hacking about XML config files? Bear in mind I've been using Java for about a week. I know nothing about ANT/Java really.</p>
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      1. POJava Web Start - Ignoring/changing Jar href URL's
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