Bug ID: JDK-8372787 ModulePatcher$PatchedModuleReader throws unspecified IllegalStateException upon being invoked after close()

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Several methods on java.lang.module.ModuleReader are specified to thrown an IOException if invoked after the reader was closed:

> @throws IOException If an I/O error occurs or the module reader is closed

jdk.internal.module.ModulePatcher$PatchedModuleReader is an (internal) implementation of ModuleReader. Some of its methods throw an unspecified IllegalStateException when invoked after being closed:

Caused by: java.lang.IllegalStateException: zip file closed
    at java.base/java.util.zip.ZipFile.ensureOpen(ZipFile.java:827)
    at java.base/java.util.zip.ZipFile.getEntry(ZipFile.java:290)
    at java.base/java.util.jar.JarFile.getEntry(JarFile.java:505)
    at java.base/java.util.jar.JarFile.getJarEntry(JarFile.java:460)
    at java.base/jdk.internal.module.ModulePatcher$JarResourceFinder.find(ModulePatcher.java:444)
    at java.base/jdk.internal.module.ModulePatcher$PatchedModuleReader.findResourceInPatch(ModulePatcher.java:301)
    at java.base/jdk.internal.module.ModulePatcher$PatchedModuleReader.find(ModulePatcher.java:357)

The JAR files containing patches shouldn't be closed so need to find out the conditions where this arises.

01-12-2025

A pull request was submitted for review. Branch: master URL: https://git.openjdk.org/jdk/pull/28569 Date: 2025-12-01 06:08:00 +0000

01-12-2025