RFR: 7945: Avoid throwing NoSuchFieldException in ValueReaders$ReflectiveReader

[Richard Startin]

On Tue, 25 Oct 2022 09:01:22 GMT, Richard Startin <duke at openjdk.org> wrote:

> When using jmc-common in a backend process we throw the following swallowed exception millions of times a day:
> 
> 
> java.lang.NoSuchFieldException: package
> 	at java.base/java.lang.Class.getField(Class.java:2149)
> 	at org.openjdk.jmc.flightrecorder.internal.parser.v1.ValueReaders$ReflectiveReader.addField(ValueReaders.java:593)
> 	at org.openjdk.jmc.flightrecorder.internal.parser.v1.TypeManager$TypeEntry.getReader(TypeManager.java:200)
> 	at org.openjdk.jmc.flightrecorder.internal.parser.v1.TypeManager.createFieldReader(TypeManager.java:493)
> 	at org.openjdk.jmc.flightrecorder.internal.parser.v1.TypeManager.access$000(TypeManager.java:86)
> 	at org.openjdk.jmc.flightrecorder.internal.parser.v1.TypeManager$TypeEntry.getReader(TypeManager.java:198)
> 	at org.openjdk.jmc.flightrecorder.internal.parser.v1.TypeManager.createFieldReader(TypeManager.java:493)
> 	at org.openjdk.jmc.flightrecorder.internal.parser.v1.TypeManager.access$000(TypeManager.java:86)
> 	at org.openjdk.jmc.flightrecorder.internal.parser.v1.TypeManager$TypeEntry.getReader(TypeManager.java:198)
> 	at org.openjdk.jmc.flightrecorder.internal.parser.v1.TypeManager.createFieldReader(TypeManager.java:493)
> 	at org.openjdk.jmc.flightrecorder.internal.parser.v1.TypeManager.access$000(TypeManager.java:86)
> 	at org.openjdk.jmc.flightrecorder.internal.parser.v1.TypeManager$TypeEntry.getReader(TypeManager.java:198)
> 	at org.openjdk.jmc.flightrecorder.internal.parser.v1.TypeManager.createFieldReader(TypeManager.java:493)
> 	at org.openjdk.jmc.flightrecorder.internal.parser.v1.TypeManager.access$000(TypeManager.java:86)
> 	at org.openjdk.jmc.flightrecorder.internal.parser.v1.TypeManager$EventTypeEntry.init(TypeManager.java:357)
> 	at org.openjdk.jmc.flightrecorder.internal.parser.v1.TypeManager.<init>(TypeManager.java:432)
> 	at org.openjdk.jmc.flightrecorder.internal.parser.v1.ChunkLoaderV1.call(ChunkLoaderV1.java:70)
> 	at org.openjdk.jmc.flightrecorder.internal.parser.v1.ChunkLoaderV1.call(ChunkLoaderV1.java:48)
> 	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
> 	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:539)
> 	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
> 	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
> 	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
> 	at java.base/java.lang.Thread.run(Thread.java:833)
> 
> 
> This adds a simple memoization to store the identifier to field mapping, with size bounded by the number of classes used in JFR events.
> 
> ---------
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rebased and updated copyright year

-------------

PR: https://git.openjdk.org/jmc/pull/447