Claude
c93a1fffbb
Runnable demos for the ankurm.com structured-concurrency-java article: the ExecutorService thread leak and its fix, every built-in Joiner, structure violations, timeouts, a custom Joiner, JSON thread dumps (in-process and jcmd), scoped values, javap diffs of the API on 25, 26, 27 and 28-ea, compiler output for six pieces of 25/26-era code, and the preview class-file trap between 27 and 28. Transcripts in output/. Co-Authored-By: Claude Sonnet 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_01CifR2BE7PBvRy5hT8TS9oz
84 lines
2.9 KiB
Plaintext
84 lines
2.9 KiB
Plaintext
$ javac --enable-preview --release 26 broken/MissingCatch.java (26.0.2.1+1)
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exit=0
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$ javac broken/MissingCatch.java (28-beta+21-ea)
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broken/MissingCatch.java:8: error: unreported exception ExecutionException; must be caught or declared to be thrown
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scope.join();
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^
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1 error
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exit=1
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$ javac --enable-preview --release 26 broken/OldFailedException.java (26.0.2.1+1)
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exit=0
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$ javac broken/OldFailedException.java (28-beta+21-ea)
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broken/OldFailedException.java:9: error: cannot find symbol
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} catch (StructuredTaskScope.FailedException e) {
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^
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symbol: class FailedException
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location: interface StructuredTaskScope
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1 error
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exit=1
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$ javac --enable-preview --release 26 broken/OldTimeoutException.java (26.0.2.1+1)
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exit=0
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$ javac broken/OldTimeoutException.java (28-beta+21-ea)
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broken/OldTimeoutException.java:11: error: cannot find symbol
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} catch (StructuredTaskScope.TimeoutException e) {
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^
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symbol: class TimeoutException
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location: interface StructuredTaskScope
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1 error
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exit=1
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$ javac --enable-preview --release 26 broken/AwaitAll.java (26.0.2.1+1)
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exit=0
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$ javac broken/AwaitAll.java (28-beta+21-ea)
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broken/AwaitAll.java:7: error: cannot find symbol
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try (var scope = StructuredTaskScope.open(Joiner.<String>awaitAll())) {
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^
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symbol: method <String>awaitAll()
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location: interface Joiner
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1 error
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exit=1
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$ javac --enable-preview --release 26 broken/OldJoiner.java (26.0.2.1+1)
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exit=0
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$ javac broken/OldJoiner.java (28-beta+21-ea)
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broken/OldJoiner.java:7: error: wrong number of type arguments; required 3
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public class OldJoiner<T> implements Joiner<T, List<T>> {
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^
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1 error
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exit=1
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$ javac --enable-preview --release 26 broken/ShutdownOnFailure.java (26.0.2.1+1)
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broken/ShutdownOnFailure.java:6: error: cannot find symbol
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try (var scope = new StructuredTaskScope.ShutdownOnFailure()) {
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^
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symbol: class ShutdownOnFailure
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location: interface StructuredTaskScope
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1 error
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exit=1
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$ javac broken/ShutdownOnFailure.java (28-beta+21-ea)
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broken/ShutdownOnFailure.java:6: error: cannot find symbol
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try (var scope = new StructuredTaskScope.ShutdownOnFailure()) {
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^
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symbol: class ShutdownOnFailure
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location: interface StructuredTaskScope
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1 error
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exit=1
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# the same sources on JDK 25 for ShutdownOnFailure
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$ javac --enable-preview --release 25 broken/ShutdownOnFailure.java (25.0.5+8-LTS)
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broken/ShutdownOnFailure.java:6: error: cannot find symbol
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try (var scope = new StructuredTaskScope.ShutdownOnFailure()) {
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^
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symbol: class ShutdownOnFailure
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location: interface StructuredTaskScope
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1 error
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exit=1
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