java.rmi.server.ExportException: 远程对象实现非法远程接口

Question

出现此错误：

1) Error injecting constructor, java.rmi.server.ExportException: remote object implements illegal remote interface; nested exception is: 
    java.lang.IllegalArgumentException: illegal remote method encountered: public abstract java.util.List com.mycompany.repository.CustomCodeRepository.getCustomCodeEntity(java.lang.String,java.lang.String,java.lang.String)
  at com.mycompany.repository.impl.CustomCodeRepositoryImpl.<init>(CustomCodeRepositoryImpl.java:63)
  while locating com.mycompany.repository.impl.CustomCodeRepositoryImpl
  at com.mycompany.guice.GuiceConfigModule.configure(GuiceConfigModule.java:79)
  while locating com.mycompany.repository.CustomCodeRepository
    for field at com.mycompany.resource.ServerResource.customCodeRepository(ServerResource.java:53)
  while locating com.mycompany.resource.ServerResource

对于此代码：

@Override
protected void configure() {
  
bind(EntityRepository.class).to(EntityRepositoryImpl.class).in(Scopes.SINGLETON);  
bind(CustomCodeRepository.class).to(CustomCodeRepositoryImpl.class).in(Scopes.SINGLETON);
}

public class CustomCodeRepositoryImpl extends UnicastRemoteObject
        implements CustomCodeRepository {

  @Inject
  @Named("xodusRoot")
  String xodusRoot;

  @Inject
  @Named("masterStore")
  String masterStore;

  @Inject 
  EntityRepository entityRepository;

  public CustomCodeRepositoryImpl() throws RemoteException {
  }

  @Override
  public String createCustomCode(String appId, String namespace, String customCodeName, String description, Long timeout, InputStream jar) {
  }
  @Override
  public List<Map<String, Comparable>> getCustomCodeEntity(String appId, String namespace, String customCodeName) {
    return entityRepository.getEntity(
            appId,
            namespace,
            Constants.ENTITYSTORE_CUSTOMCODE,
            Constants.CUSTOMCODE_NAME,
            customCodeName,
            new ArrayList<>());
  }

Answer 1

正如 guice 在其异常中提到的那样，它是一个嵌套异常。内部异常是：

java.lang.IllegalArgumentException: illegal remote method encountered: public abstract java.util.List com.mycompany.repository.CustomCodeRepository.getCustomCodeEntity(java.lang.String,java.lang.String,java.lang.String)

我猜你正在覆盖 java.rmi.Remote。如果是这样，那么我将引用 Illegal remote method in java:

All of the methods on a RMI Remote interface must declare RemoteException in their throws clause.

这意味着您需要在扩展Remote 的接口中的所有方法的声明中添加throws RemoteException。那大概就是CustomCodeRepository.