嵌入式Neo4j数据库在启动时抛出permgen和OutOfMemoryError

我使用的是Spring数据Neo4j 3.2.0和Neo4j 2.1.2

我使用Gradle作为构建工具，并使用Gradle tomcat插件启动正在开发的应用程序。几天来，这一切都很顺利

现在，在过去的一天中，我开始在启动应用程序时出现内存错误。有时，在运行查询之前不会发生错误，但偶尔在启动时会出现内存错误

Exception: java.lang.OutOfMemoryError thrown from the UncaughtExceptionHandler in thread "main"

Exception: java.lang.OutOfMemoryError thrown from the UncaughtExceptionHandler in thread "qtp1102557897-37"

Exception: java.lang.OutOfMemoryError thrown from the UncaughtExceptionHandler in thread "qtp1102557897-36"

Exception: java.lang.OutOfMemoryError thrown from the UncaughtExceptionHandler in thread "HashSessionScavenger-0"

Exception: java.lang.OutOfMemoryError thrown from the UncaughtExceptionHandler in thread "qtp1102557897-38"

Exception: java.lang.OutOfMemoryError thrown from the UncaughtExceptionHandler in thread "qtp1102557897-39"

Exception: java.lang.OutOfMemoryError thrown from the UncaughtExceptionHandler in thread "qtp1102557897-40"

Exception: java.lang.OutOfMemoryError thrown from the UncaughtExceptionHandler in thread "RMI RenewClean-[10.30.65.86:51134]"

如何启动嵌入式服务器：

public EmbeddedGraphDatabase createEmbeddedDatabase(String storeDir) {
        return (EmbeddedGraphDatabase) new GraphDatabaseFactory()
                .newEmbeddedDatabaseBuilder( storeDir )
                .setConfig(GraphDatabaseSettings.allow_store_upgrade, "true")
                .setConfig(ShellSettings.remote_shell_enabled, "true")
                .newGraphDatabase();

Gradle正在使用标准配置启动，该配置在运行后如下所示：

java -Xmx512m -classpath /Users/rwalls/Development/gradle-1.12/lib/gradle-launcher-1.12.jar org.gradle.launcher.GradleMain tomcatRunWar

存储文件大小：

{
    "description": "Information about the sizes of the different parts of the Neo4j graph store",
    "name": "org.neo4j:instance=kernel#0,name=Store file sizes",
    "attributes": [
      {
        "description": "The total disk space used by this Neo4j instance, in bytes.",
        "name": "TotalStoreSize",
        "value": 291941310,
        "isReadable": "true",
        "type": "long",
        "isWriteable": "false ",
        "isIs": "false "
      },
      {
        "description": "The amount of disk space used by the current Neo4j logical log, in bytes.",
        "name": "LogicalLogSize",
        "value": 184,
        "isReadable": "true",
        "type": "long",
        "isWriteable": "false ",
        "isIs": "false "
      },
      {
        "description": "The amount of disk space used to store array properties, in bytes.",
        "name": "ArrayStoreSize",
        "value": 128,
        "isReadable": "true",
        "type": "long",
        "isWriteable": "false ",
        "isIs": "false "
      },
      {
        "description": "The amount of disk space used to store nodes, in bytes.",
        "name": "NodeStoreSize",
        "value": 4341060,
        "isReadable": "true",
        "type": "long",
        "isWriteable": "false ",
        "isIs": "false "
      },
      {
        "description": "The amount of disk space used to store properties (excluding string values and array values), in bytes.",
        "name": "PropertyStoreSize",
        "value": 16972278,
        "isReadable": "true",
        "type": "long",
        "isWriteable": "false ",
        "isIs": "false "
      },
      {
        "description": "The amount of disk space used to store relationships, in bytes.",
        "name": "RelationshipStoreSize",
        "value": 39276426,
        "isReadable": "true",
        "type": "long",
        "isWriteable": "false ",
        "isIs": "false "
      },
      {
        "description": "The amount of disk space used to store string properties, in bytes.",
        "name": "StringStoreSize",
        "value": 1476352,
        "isReadable": "true",
        "type": "long",
        "isWriteable": "false ",
        "isIs": "false "
      }
    ],
    "url": "org.neo4j/instance%3Dkernel%230%2Cname%3DStore+file+sizes"
  }

服务器配置（似乎依赖于启动）：

我意识到我可以在分配更多内存的情况下启动java。。。但尝试了许多不同的选择，仍然有错误

想法

我的下一步是在标准tomcat实例（而不是gradle）中运行该应用程序，看看这是否会有所不同

编辑

堆栈跟踪：

Caused by: java.lang.OutOfMemoryError: PermGen space
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
    at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
    at org.gradle.internal.classloader.MultiParentClassLoader.loadClass(MultiParentClassLoader.java:63)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:412)
    at org.gradle.internal.classloader.CachingClassLoader.loadClass(CachingClassLoader.java:41)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:412)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:412)
    at org.gradle.internal.classloader.FilteringClassLoader.loadClass(FilteringClassLoader.java:80)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:412)
    at org.gradle.internal.classloader.CachingClassLoader.loadClass(CachingClassLoader.java:41)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:412)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
    at org.apache.tools.ant.AntClassLoader.findBaseClass(AntClassLoader.java:1385)
    at org.apache.tools.ant.AntClassLoader.loadClass(AntClassLoader.java:1080)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:412)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:412)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
    at ch.qos.logback.classic.spi.PackagingDataCalculator.loadClass(PackagingDataCalculator.java:202)
    at ch.qos.logback.classic.spi.PackagingDataCalculator.bestEffortLoadClass(PackagingDataCalculator.java:221)
    at ch.qos.logback.classic.spi.PackagingDataCalculator.computeBySTEP(PackagingDataCalculator.java:136)
    at ch.qos.logback.classic.spi.PackagingDataCalculator.populateUncommonFrames(PackagingDataCalculator.java:111)
    at ch.qos.logback.classic.spi.PackagingDataCalculator.populateFrames(PackagingDataCalculator.java:103)
    at ch.qos.logback.classic.spi.PackagingDataCalculator.calculate(PackagingDataCalculator.java:55)

messages.log的粘贴箱：

---

线程转储的粘贴库：

将此行添加到

gradle.properties

org.gradle.jvmargs=-XX:+UseConcMarkSweepGC -Xmx2048m -Xms512m -server -XX:MaxPermSize=512M

它似乎已经解决了这个问题

---

我之前的尝试失败，因为我正在更新

GRADLE\u OPTS

，这显然不会将内存更改传递给生成的tomcat实例。

您有完整的堆栈跟踪可用吗？您还可以共享neo4j日志文件graph.db/messages.log吗？当这些错误发生时，也许可以使用jstack（其中还包括堆信息）创建一个threaddump。@MichaelHunger我用您想要的信息更新了我的答案。谢谢

org.gradle.jvmargs=-XX:+UseConcMarkSweepGC -Xmx2048m -Xms512m -server -XX:MaxPermSize=512M