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Java Virtual Machine arguments can be specified inside an Eclipse launch configuration:

Why do I sometimes get a java.lang.NoSuchMethodError exception after reloading my page

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Tapestry's live class reloading is not perfect

Footnote
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The perfect is the enemy of the good.

It tends to use a lot of Java ClassLoaders on top of the normal ClassLoaders used by the Java Virtual Machine and the servlet container. When you change non-component classes and interfaces that are referenced by components and pages, such as to add or change a method, only the component classes are reloaded. The non-component classes are frozen as they were when they were first loaded.

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