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| <meta name="abstract" content="Class loaders load classes into the memory of the JVM. When analyzing the heap, class loaders are very important for two reasons: First, applications typically load components using separate class loaders. Second, the loaded classes are usually stored in a separate space (e.g. the perm space) which can also be depleted." /> |
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| <h1 class="title topictitle1" id="ariaid-title1">Analyze Class Loader</h1> |
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| <div class="body refbody"><p class="shortdesc"> |
| Class loaders load classes into the memory of the JVM. When |
| analyzing the heap, class loaders are very important for two reasons: |
| First, applications typically load components using separate class |
| loaders. Second, the loaded classes are usually stored in a separate space (e.g. the perm space) |
| which can also be depleted. |
| </p> |
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| <div class="section"><h2 class="title sectiontitle">Class Loader Explorer</h2> |
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| <div class="p"> |
| To get an overview, run the |
| <span class="ph menucascade"><span class="ph uicontrol">Query Browser</span><abbr title="and then"> > </abbr><span class="ph uicontrol">Java Basics</span><abbr title="and then"> > </abbr><span class="ph uicontrol">Class Loader Explorer</span></span> |
| inspection on the heap dump. |
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| <ul class="ul"> |
| <li class="li">The Memory Analyzer attaches a meaningful label to the class |
| loader - in the case of OSGi bundles it is the bundle id. Looking |
| out for duplicate entries!</li> |
| |
| <li class="li">Next to the class loader name, the table contains the defined |
| classes and the number of live instances. If one and the same |
| component is loaded multiple times, the number of live instances |
| can indicate which class loaders is more alive and which one |
| should be garbage collected.</li> |
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| </ul> |
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| </div> |
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| <img class="image" src="analyzingclassloader_explorer.png" alt="Class Loader Explorer" /> |
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| <p class="p"> |
| Find more information in this blog posting: |
| <a class="xref" href="http://dev.eclipse.org/blogs/memoryanalyzer/2008/05/17/the-unknown-generation-perm/" target="_blank">The Unknown Generation: Perm</a> |
| </p> |
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