Question

我正在使用Trident风暴并尝试在函数prepare方法中启动网格实例。相同的配置文件适用于本地群集。当我在remore群集中提交它时，我收到错误。

代码：

public class MemoryGrid extends BaseFunction {

private static final long serialVersionUID = -4574506761580804738L;
private static final String configFileLocation = "file:///home/path/config.xml";
MemGridDAO memgriddao;
public void prepare(Map conf, TridentOperationContext context){
    this.memgriddao = new MemGridDAO (configFileLocation);
}
public void execute(TridentTuple tuple, TridentCollector collector) {
    try {
        memgriddao.put("cahcename",tuple.getValue(0),tuple.getValue(1));
    } catch (GridException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

    collector.emit(null);
} 

 public class MemGridDAO {

  public MemGridDAO(String configFile){

  Grid grid = GridGain.start(configFile);
  }

  }

错误

 java.lang.IncompatibleClassChangeError: Implementing class
    at java.lang.ClassLoader.defineClass1(Native Method) ~[na:1.7.0_45]
    at java.lang.ClassLoader.defineClass(ClassLoader.java:800) ~[na:1.7.0_45]
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) ~[na:1.7.0_45]
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:449) ~[na:1.7.0_45]
    at java.net.URLClassLoader.access$100(URLClassLoader.java:71) ~[na:1.7.0_45]
    at java.net.URLClassLoader$1.run(URLClassLoader.java:361) ~[na:1.7.0_45]
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355) ~[na:1.7.0_45]
    at java.security.AccessController.doPrivileged(Native Method) ~[na:1.7.0_45]
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354) ~[na:1.7.0_45]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:425) ~[na:1.7.0_45]
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308) ~[na:1.7.0_45]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:358) ~[na:1.7.0_45]
    at java.lang.Class.forName0(Native Method) ~[na:1.7.0_45]
    at java.lang.Class.forName(Class.java:190) ~[na:1.7.0_45]
    at org.gridgain.grid.util.GridUtils.addLog4jNoOpLogger(GridUtils.java:7697) ~[stormjar.jar:na]
    at org.gridgain.grid.kernal.GridGainEx.start(GridGainEx.java:732) ~[stormjar.jar:na]
    at org.gridgain.grid.kernal.GridGainEx.start(GridGainEx.java:677) ~[stormjar.jar:na]
    at org.gridgain.grid.kernal.GridGainEx.start(GridGainEx.java:524) ~[stormjar.jar:na]
    at org.gridgain.grid.kernal.GridGainEx.start(GridGainEx.java:494) ~[stormjar.jar:na]
    at org.gridgain.grid.GridGain.start(GridGain.java:314) ~[stormjar.jar:na]

Answer 1

这可能是编译问题。尝试做一个干净的构建。它可能是因为所有依赖类之间的.class文件不匹配。

IncompatibleClassChangeError扩展了LinkageError，它与从编译子类后更改的基类引发的问题有关。

更多内容：http://examples.javacodegeeks.com/java-basics/exceptions/java-lang-incompatibleclasschangeerror-how-to-resolve-incompatible-class-change-error/

Answer 2

您的远程集群应用程序类路径中似乎有多个不兼容的Log4j jar版本（很可能是其中一个是GridGain依赖项，另一个已经存在您的应用程序依赖项）。

您需要使用与GridGain相同版本的Log4j，或者将GridGain配置为使用非log4j日志记录。例如，如果要保留Log4j的版本，可以使用GridSlf4jLogger和正确的SLF4j-to-Log4j绑定。

Gridgain exception java.lang.IncompatibleClassChangeError：实现类

2 个答案: