假设您有一个定义copyFile(String,String)方法的Java类：

public class FileSystem {

    public static void copyFile(String sourcePath, String destinationPath)
        throws IOException
    {
        // ignore the fact that I'm not properly managing resources...
        FileInputStream source = new FileInputStream(sourcePath);
        FileOutputStream destination = new FileOutputStream(destinationPath);

        copyStream(source, destination);

        source.close();
        destination.close();
    }

    private static void copyStream(InputStream source, OutputStream destination)
        throws IOException
    {
        byte[] buffer = new byte[1024];

        int length;
        while ( (length = source.read(buffer)) != -1 ) {
            destination.write(buffer, 0, length);
        }
    }

}

并假设您将其包装在Java存储过程中：

CREATE PROCEDURE copy_file (source_path VARCHAR2, destination_path VARCHAR2)
AS LANGUAGE JAVA
NAME 'FileSystem.copyFile(String, String)';

现在假设您调用copy_file存储过程并抛出Java IOException：

BEGIN
  copy_file( '/some/file/that/does/not/exist.txt', '/path/to/destination.txt' );
END;

在PL / SQL块中,引发的错误是：

ORA-29532 Java call terminated by uncaught Java exception

错误消息还包含未捕获的异常的描述,但它仍然是ORA-29532.有没有办法从Java中抛出一个Exception来指示错误代码和PL / SQL中引发的错误消息？

解决方法:

据我所知,Oracle无法直接捕获Java错误. ORA-29532的Oracle文档说明证实了这一想法：

ORA-29532: Java call terminated by uncaught Java exception: string

Cause: A Java exception or error was signaled and could not be resolved by the Java code.

Action: Modify Java code, if this behavior is not intended.

根据这篇文章,我认为你应该在Java代码中处理异常.

你可以用这些东西解决这个问题：

> Java函数的返回值可能是String – 不是void,您可以在返回变量中发送错误描述.
>您可以将错误保存到Java代码中的Oracle表中,并在PL / SQL代码中读取它.
>您只需使用System.out.println();将错误发送到Oracle用户转储文件.

编辑：亚当的最终解决方案

这大致是我根据答案实现的：

package mypackage;

public class MyClass {

    public static final int SUCCESS = 1;
    public static final int FAILURE = 0;

    /**
     * This method actually performs the business logic.
     */
    public static void doSomething(String arg1, String arg2) throws SQLException {
        // Actually do something...
    }

    /**
     * This method is called from PL/SQL.
     */
    public static int doSomething(String arg1, String arg2, int[] errorCode, String[] errorMessage) {
        try {
            doSomething(arg1, arg2);
            return success();
        } catch (SQLException e) {
            return failure(e, errorCode, errorMessage);
        }
    }

    private static int success() {
        return SUCCESS;
    }

    private static int failure(SQLException e, int[] errorCode, String[] errorMessage) {
        errorCode[0] = e.getErrorCode();
        errorMessage[0] = e.getMessage();
        return FAILURE;
    }

}

然后在PL / SQL中：

SUCCESS CONSTANT BINARY_INTEGER := 1;
FAILURE CONSTANT BINARY_INTEGER := 0;

SUBTYPE error_code_type  IS BINARY_INTEGER;
SUBTYPE error_message_type IS VARCHAR2(1000);

PROCEDURE
  raise_error_if_failure
  (
    status        BINARY_INTEGER,
    error_code    ERROR_CODE_TYPE,
    error_message ERROR_MESSAGE_TYPE
  )
  IS
BEGIN
  IF status = FAILURE THEN
    raise_application_error(error_code, error_message);
  END IF;
END;


FUNCTION
  do_something_in_java
  (
    arg1          VARCHAR2,
    arg2          VARCHAR2,
    error_code    OUT ERROR_CODE_TYPE,
    error_message OUT ERROR_MESSAGE_TYPE
  )
  RETURN BINARY_INTEGER
    AS LANGUAGE JAVA
    NAME 'mypackage.MyClass.doSomething(java.lang.String, java.lang.String, int[], java.lang.String[]) return int';


PROCEDURE
  do_something
  (
    arg1 VARCHAR2,
    arg2 VARCHAR2
  )
IS
  error_code    ERROR_CODE_TYPE;
  error_message ERROR_MESSAGE_TYPE;
BEGIN
  raise_error_if_failure(
      do_something_in_java(arg1, arg2, error_code, error_message),
      error_code,
      error_message
    );
END;