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spring-boot-demo-oom: five real memory-leak demos with captured OOM + MAT evidence

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asmhatre
2026-10-01 12:11:56 +00:00
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unbounded-queue-leak/docs/output/01-oom-console.txt
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$ java -Xmx160m -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=docs/output/heap.hprof -jar target/unbounded-queue-leak.jar
unbounded-queue-leak: driving an unbounded queue to OOM, consumer sleeps 50ms/item
java.lang.OutOfMemoryError: Java heap space
Dumping heap to docs/output/heap.hprof ...
Heap dump file created [175828534 bytes in 0.250 secs]
Caused by: java.lang.OutOfMemoryError: Java heap space
at java.base/java.util.concurrent.LinkedBlockingQueue.put(LinkedBlockingQueue.java:329)
at com.ankurm.oomdemo.UnboundedQueueLeakApplication.lambda$driveLeak$0(UnboundedQueueLeakApplication.java:53)
at com.ankurm.oomdemo.UnboundedQueueLeakApplication$$Lambda/0x000000000b247688.run(Unknown Source)
at org.springframework.boot.SpringApplication.lambda$callRunner$0(SpringApplication.java:788)
at org.springframework.boot.SpringApplication$$Lambda/0x000000000b25ccd0.acceptWithException(Unknown Source)
at org.springframework.util.function.ThrowingConsumer$1.acceptWithException(ThrowingConsumer.java:82)
at org.springframework.util.function.ThrowingConsumer.accept(ThrowingConsumer.java:60)
unbounded-queue-leak/docs/output/02-mat-leak-suspects.txt
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Eclipse MAT 1.17.0 batch report (org.eclipse.mat.api:suspects) on heap.hprof -- Problem Suspect 1
================================================================================================
Problem Suspect 1 One instance of java.util.concurrent.LinkedBlockingQueue loaded by <system
class loader> occupies 79,698,088 (92.41%) bytes. The top consumers of its minimum retained heap
are byte[] (152 instances totaling 79,694,208), java.util.concurrent.LinkedBlockingQueue$Node
(153 instances totaling 3,672), and java.util.concurrent.locks.ReentrantLock$NonfairSync (2
instances totaling 64). The instance is referenced by
com.ankurm.oomdemo.UnboundedQueueLeakApplication$$Lambda+0x000000000b25d428 @ 0xf63bb570 ,
loaded by org.springframework.boot.loader.launch.LaunchedClassLoader @ 0xf631bab8 . The memory
is accumulated in one instance of java.util.concurrent.LinkedBlockingQueue$Node , loaded by
<system class loader> , which occupies 1,572,984 (1.82%) bytes. Thread java.lang.Thread @
0xfcc19e38 main has a local variable or reference to java.util.concurrent.LinkedBlockingQueue @
0xff7386e8 which is on the shortest path to java.util.concurrent.LinkedBlockingQueue$Node @
0xfccce5c0 . The thread java.lang.Thread @ 0xfcc19e38 main keeps local variables with total size
632,832 (0.73%) bytes. The top consumers of its minimum retained heap are byte[] (152 instances
totaling 79,694,208), java.util.concurrent.LinkedBlockingQueue$Node (153 instances totaling
3,672), and java.util.concurrent.locks.ReentrantLock$NonfairSync (2 instances totaling 64).
Significant stack frames and local variables com.ankurm.oomdemo.UnboundedQueueLeakApplication.la
mbda$driveLeak$0(Lorg/springframework/boot/ApplicationArguments;)V
(UnboundedQueueLeakApplication.java:53) java.util.concurrent.LinkedBlockingQueue @ 0xff7386e8
retains 79,698,088 (92.41%) bytes The stacktrace of this Thread is available. See stacktrace .
See stacktrace with involved local variables .