java.util.jar.JarFile cause native heap memory leak

最近项目中使用了JarFile 这个类 来load jar包中的 configuration,大致的情况如下

public void processJarEntries(JarFile paramJarFile, ZipEntryFilter paramZipEntryFilter, ZipEntryProcessor paramZipEntryProcessor)
  {
    for (Enumeration localEnumeration = paramJarFile.entries(); localEnumeration.hasMoreElements(); ) {
      ZipEntry localZipEntry = (ZipEntry)localEnumeration.nextElement();
      if (paramZipEntryFilter.accept(localZipEntry))
        paramZipEntryProcessor.process(paramJarFile, localZipEntry);
    }
  }

ZipEntryFilter 是过滤jar文件中不相关的文件 ZipEntryProcessor 用来做具体对找到的文件操作

问题引入： 此时会通过JarFile中的 两个method 来 遍历jar包中的文件 hasMoreElements & nextElment

在多线程处理的情况下引起 native heap memory leak 可以 通过  pmap -ax pid|grep heap 来查看

解决：

JarInputStream localJarInputStream = null;

localJarInputStream = new JarInputStream(getBufferedInputStream(paramFile));

public static InputStream getBufferedInputStream(File paramFile) throws IOException {
    FileInputStream localFileInputStream = new FileInputStream(paramFile);
    return new BufferedInputStream(localFileInputStream);
  }

public void processJarEntries(JarInputStream paramJarInputStream, JarEntryProcessor paramJarEntryProcessor) {
    ZipEntry localZipEntry = paramJarInputStream.getNextEntry();
    while (localZipEntry != null) {
      paramJarEntryProcessor.process(localZipEntry);
      localZipEntry = paramJarInputStream.getNextEntry();
    }
    paramJarEntryProcessor.completeProcess();
  }

此bug可以在oracle官网中查到