远程服务器接口上的Java ClassNotFound异常
远程服务器接口上的Java ClassNotFound异常
提问于 2018-09-29 02:19:58
这是我的服务器main的代码
public static void main(String Args[]){
try {
masterDAO = MasterDAO.getInstance();
} catch (MasterException e) {
e.printStackTrace();
LOGGER.log(Level.SEVERE,e.getMessage() + "MASTER SHUTDOWN");
System.exit(1);
}
final int REGISTRYPORT = 1499;
String registryHost = "localhost";
String serviceName = "MasterService";
try {
String completeName = "//" + registryHost + ":" + REGISTRYPORT + "/" + serviceName;
System.out.println(completeName);
MasterInterface master = (MasterInterface) new Master();
registry = LocateRegistry.createRegistry(REGISTRYPORT);
registry.rebind(completeName, master);
System.out.println("Master Bound ");
}
catch (Exception e) {
System.err.println("Master exception: ");
e.printStackTrace();
}
}这是客户端的一个方法：
public FileLocation getFileLocation(String fileName, String operation){
final int REGISTRYPORT = 1499;
String serviceName = "MasterService";
String completeName = "//" + "localhost" + ":" + REGISTRYPORT + "/" + serviceName;
try {
System.out.println(completeName);
Registry masterRegistry = LocateRegistry.getRegistry(1499);
System.out.println(globalInformation.getHost() + " "+REGISTRYPORT);
MasterInterface master = (MasterInterface) masterRegistry.lookup(completeName);
//System.out.println("Get File Location - Result: " + fileLocation.isResult() + " - Port: "+ fileLocation.getFilePositions());
return master.checkFile(fileName,operation);
}
catch (NotBoundException | IOException e) {
e.printStackTrace();
} catch (FileNotFoundException e) {
System.out.println("ERROR 404 FILE NOT FOUND");
} catch (MasterException e) {
System.out.println("ERROR 500 INTERNAL SERVER ERROR");
}
return null;
}我得到了这个异常
java.rmi.UnmarshalException: error unmarshalling return; nested exception is:
java.lang.ClassNotFoundException: MasterInterface (no security manager: RMI class loader disabled)
at sun.rmi.registry.RegistryImpl_Stub.lookup(RegistryImpl_Stub.java:127)
at com.sdcc_project.cloudlet.controller.CloudLetController.getFileLocation(CloudLetController.java:125)
at com.sdcc_project.cloudlet.controller.CloudLetController.writeToMaster(CloudLetController.java:149)
at com.sdcc_project.cloudlet.CloudletApplication$3.run(CloudletApplication.java:126)
Caused by: java.lang.ClassNotFoundException: MasterInterface (no security manager: RMI class loader disabled)
at sun.rmi.server.LoaderHandler.loadProxyClass(LoaderHandler.java:556)
at java.rmi.server.RMIClassLoader$2.loadProxyClass(RMIClassLoader.java:646)
at java.rmi.server.RMIClassLoader.loadProxyClass(RMIClassLoader.java:311)
at sun.rmi.server.MarshalInputStream.resolveProxyClass(MarshalInputStream.java:265)
at java.io.ObjectInputStream.readProxyDesc(ObjectInputStream.java:1800)
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1748)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2042)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1573)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:431)
at sun.rmi.registry.RegistryImpl_Stub.lookup(RegistryImpl_Stub.java:123)
... 3 more服务器在本地执行，启动它的主服务器，客户端就像tomcat服务器上的spring应用程序一样执行。在spring上部署之前，我习惯于像运行普通应用程序一样运行客户端，一切都运行得很好，所以我认为问题可能出在tomcat类路径上？这是项目的包-->
回答 1
Stack Overflow用户
回答已采纳
发布于 2018-09-29 02:54:06
服务器端应用程序与客户端应用程序的共享类和接口(例如MasterInterface)具有不同的包名可能会导致此问题。
检查两个项目，并确保它在两个项目中具有相同的名称。尝试实现相同的层次结构，例如：
package com.xx.yy.server_intarface; // same in server and client application
public interface MasterInterface { ...这解决了问题，但不仅"package“值必须相同，而且所有导入路径也必须相同。
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原文链接：
https://stackoverflow.com/questions/52560807
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