daniells92 commented on issue #2248:
URL: https://github.com/apache/plc4x/issues/2248#issuecomment-3291612045
Hello,
we have the same issue.
plc4j version 0.12.0 connected to a S7_300.
The application runs 24/7.
It reads every second from the PLC and writes event based every few seconds.
Sometimes it takes 1-2 weeks until an OutOfMemmoryError, sometimes it's over
one month.
Seems like it directly allocates memory and never releases it.
2025-07-21 08:49:33,460 INFO | plc4x-tm-thread-2 |
o.a.p.java.spi.transaction.RequestTransactionManager |
java.lang.OutOfMemoryError: Cannot reserve 4194304 bytes of direct buffer
memory (allocated: 2118267416, limit: 2122317824)
2025-07-21 08:49:42,987 WARN | scheduling-1 |
de.myApp.plcbridge.s7.S7Reader | Could not execute read request!
java.util.concurrent.ExecutionException:
org.apache.plc4x.java.api.exceptions.PlcProtocolException: Error reading
at
java.base/java.util.concurrent.CompletableFuture.reportGet(CompletableFuture.java:396)
at
java.base/java.util.concurrent.CompletableFuture.get(CompletableFuture.java:2073)
at de.myApp.plcbridge.s7.S7Reader.readFromPlc(S7Reader.java:66)
at
java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
at java.base/java.lang.reflect.Method.invoke(Method.java:580)
at
org.springframework.scheduling.support.ScheduledMethodRunnable.runInternal(ScheduledMethodRunnable.java:130)
at
org.springframework.scheduling.support.ScheduledMethodRunnable.lambda$run$2(ScheduledMethodRunnable.java:124)
at io.micrometer.observation.Observation.observe(Observation.java:498)
at
org.springframework.scheduling.support.ScheduledMethodRunnable.run(ScheduledMethodRunnable.java:124)
at
org.springframework.scheduling.config.Task$OutcomeTrackingRunnable.run(Task.java:85)
at
org.springframework.scheduling.support.DelegatingErrorHandlingRunnable.run(DelegatingErrorHandlingRunnable.java:54)
at
java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:572)
at
java.base/java.util.concurrent.FutureTask.runAndReset(FutureTask.java:358)
at
java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:305)
at
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
at
java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
at java.base/java.lang.Thread.run(Thread.java:1583)
Caused by: org.apache.plc4x.java.api.exceptions.PlcProtocolException: Error
reading
at
org.apache.plc4x.java.s7.readwrite.protocol.S7ProtocolLogic.lambda$18(S7ProtocolLogic.java:314)
at
java.base/java.util.concurrent.CompletableFuture.uniWhenComplete(CompletableFuture.java:863)
at
java.base/java.util.concurrent.CompletableFuture$UniWhenComplete.tryFire(CompletableFuture.java:841)
at
java.base/java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:510)
at
java.base/java.util.concurrent.CompletableFuture.completeExceptionally(CompletableFuture.java:2194)
at
org.apache.plc4x.java.s7.readwrite.protocol.S7ProtocolLogic$TransactionErrorCallback.accept(S7ProtocolLogic.java:2202)
at
org.apache.plc4x.java.s7.readwrite.protocol.S7ProtocolLogic$TransactionErrorCallback.accept(S7ProtocolLogic.java:1)
at
org.apache.plc4x.java.spi.Plc4xNettyWrapper.lambda$8(Plc4xNettyWrapper.java:253)
at
org.apache.plc4x.java.spi.netty.NettyHashTimerTimeoutManager.lambda$0(NettyHashTimerTimeoutManager.java:55)
at
io.netty.util.HashedWheelTimer$HashedWheelTimeout.run(HashedWheelTimer.java:713)
at
io.netty.util.concurrent.ImmediateExecutor.execute(ImmediateExecutor.java:34)
at
io.netty.util.HashedWheelTimer$HashedWheelTimeout.expire(HashedWheelTimer.java:701)
at
io.netty.util.HashedWheelTimer$HashedWheelBucket.expireTimeouts(HashedWheelTimer.java:787)
at io.netty.util.HashedWheelTimer$Worker.run(HashedWheelTimer.java:501)
... 1 common frames omitted
Caused by: java.util.concurrent.TimeoutException: null
at
org.apache.plc4x.java.spi.netty.NettyHashTimerTimeoutManager.lambda$0(NettyHashTimerTimeoutManager.java:54)
... 6 common frames omitted`
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