JavaFX class is loaded by DeployClassLoader. Without enough elevated permission, when unsigned user code use javax.jnlp.FileOpenService, for example, which triggers a FX dialog trying to load resources within jfxrt.jar, it could fail as File read permission to jfxrt.jar is not granted by the sandbox permission. The bug was originally reported at http://javafx-jira.kenai.com/browse/RT-15819.
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