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Add sample application to show thread leaks · baryonsit/sample-java-programs@7dab469 · GitHub

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Add sample application to show thread leaks
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‎pom.xml‎

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<module>hotmethods</module>
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<module>latencies</module>
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<module>allocations</module>
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<module>memoryleak</module>
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<module>deadlock</module>
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<module>memoryleak</module>
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<module>threadleak</module>
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</modules>
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<dependencyManagement>
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<artifactId>base</artifactId>
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<version>${samples.version}</version>
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</dependency>
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<dependency>
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<groupId>org.hdrhistogram</groupId>
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<artifactId>HdrHistogram</artifactId>
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<version>${hdrhistogram.version}</version>
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</dependency>
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</dependencies>
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</dependencyManagement>
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<javac.target>1.8</javac.target>
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<samples.version>0.0.2-SNAPSHOT</samples.version>
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<jcommander.version>1.72</jcommander.version>
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<hdrhistogram.version>2.1.10</hdrhistogram.version>
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</properties>
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</project>

‎threadleak/README.md‎

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Sample to show thread leaks in a Java Application
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=================================================
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This sample application implements merge sort algorithm using multiple threads.
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The algorithm for parallel merge sort was taken from the [Merge Sort example available online from the University
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of Washington](https://courses.cs.washington.edu/courses/cse373/13wi/lectures/03-13/MergeSort.java)
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The original example uses threads directly. This sample application uses an `ExecutorService` to run threads.
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This application runs continuously and prints an interval summary statistics of algorithm run time for multiple random
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number arrays. The application will also print final summary statistics of algorithm run time at the program exit.
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### How to run
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The application will throw Out of Memory error after some time when you run following command
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`java -Xmx1g -XX:+UnlockDiagnosticVMOptions -XX:+DebugNonSafepoints
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-XX:+UnlockCommercialFeatures -XX:+FlightRecorder
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-XX:StartFlightRecording=settings=profile,duration=2m,name=ThreadLeak,filename=threadleak.jfr
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-XX:FlightRecorderOptions=loglevel=info
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-jar target/threadleak.jar`
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### Analyzing Java Flight Recording
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In Threads -> Overview tab, you should see thread count is increasing steadily.
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### How to fix the Thread Leak
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Run the application with `--stop-leakage` parameter, which will use a single `ExecutorService` throughout the
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application.

‎threadleak/pom.xml‎

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<?xml version="1.0" encoding="utf-8"?>
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<!--
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# Copyright 2018 M. Isuru Tharanga Chrishantha Perera
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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-->
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<parent>
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<groupId>com.github.chrishantha.sample</groupId>
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<artifactId>java-samples</artifactId>
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<version>0.0.2-SNAPSHOT</version>
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<relativePath>../pom.xml</relativePath>
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</parent>
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<modelVersion>4.0.0</modelVersion>
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<artifactId>threadleak</artifactId>
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<packaging>jar</packaging>
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<name>threadleak</name>
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<dependencies>
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<dependency>
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<groupId>com.github.chrishantha.sample</groupId>
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<artifactId>base</artifactId>
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</dependency>
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<dependency>
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<groupId>org.hdrhistogram</groupId>
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<artifactId>HdrHistogram</artifactId>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-shade-plugin</artifactId>
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</plugin>
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</plugins>
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</build>
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</project>

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