java - JCO_ERROR_RESOURCE : Destination ABAP_AS_WITHOUT_POOL does not exist. ..通过 JCo 连接时出错

Question

我正在开发一个 Java 应用程序，需要从 SAP 表中的 SAP 系统获取数据。我尝试使用 SAP Java Connector 3.X 将软件与 SAP 系统连接，但我在使用目标时遇到问题。

我使用了 SAP Java 连接器附带的代码示例。

public class CustomDestinationDataProvider {

static class MyDestinationDataProvider implements DestinationDataProvider {
    private DestinationDataEventListener eL;
    private HashMap<String, Properties> secureDBStorage = new HashMap<String, Properties>();
    
    public Properties getDestinationProperties(String ABAP_AS) {
        try {
            //read the destination from DB
            Properties p = secureDBStorage.get(ABAP_AS);

            if(p!=null) {
                //check if all is correct, for example
                if(p.isEmpty())
                    throw new DataProviderException(DataProviderException.Reason.INVALID_CONFIGURATION, "destination configuration is incorrect", null);

                return p; 
                }
            
            return null; 
            } catch(RuntimeException re) {
            throw new DataProviderException(DataProviderException.Reason.INTERNAL_ERROR, re);
        }
    }

    //An implementation supporting events has to retain the eventListener instance provided
    //by the JCo runtime. This listener instance shall be used to notify the JCo runtime
    //about all changes in destination configurations.
    public void setDestinationDataEventListener(DestinationDataEventListener eventListener) {
        this.eL = eventListener;
    }

    public boolean supportsEvents() {
        return true;
    }

    //implementation that saves the properties in a very secure way
    void changeProperties(String ABAP_AS, Properties properties) {
        synchronized(secureDBStorage) {
            if(properties==null) {
                if(secureDBStorage.remove(ABAP_AS)!=null)
                    eL.deleted(ABAP_AS);
            } else {
                secureDBStorage.put(ABAP_AS, properties);
                eL.updated(ABAP_AS); // create or updated
            }
        }
    }
} // end of MyDestinationDataProvider

//business logic
void executeCalls(String ABAP_AS) {
    JCoDestination dest;
    try {
        dest = JCoDestinationManager.getDestination(ABAP_AS);
        dest.ping();
        System.out.println("Destination " + ABAP_AS + " works");
    } catch(JCoException e) {
        e.printStackTrace();
        System.out.println("Execution on destination " + ABAP_AS + " failed");
    }
}

static Properties getDestinationPropertiesFromUI() {
    //adapt parameters in order to configure a valid destination
    Properties connectProperties = new Properties();
    connectProperties.setProperty(DestinationDataProvider.JCO_ASHOST, "XXX");
    connectProperties.setProperty(DestinationDataProvider.JCO_SYSNR,  "XX");
    connectProperties.setProperty(DestinationDataProvider.JCO_CLIENT, "XXX");
    connectProperties.setProperty(DestinationDataProvider.JCO_USER,   "XXX");
    connectProperties.setProperty(DestinationDataProvider.JCO_PASSWD, "XXX");
    connectProperties.setProperty(DestinationDataProvider.JCO_LANG,   "XX");
    createDestinationDataFile(ABAP_AS, connectProperties);
    return connectProperties;
}

static void createDestinationDataFile(String ABAP_AS, Properties connectProperties) {
    File destCfg = new File(ABAP_AS + ".jcoDestination");
    try {
        FileOutputStream fos = new FileOutputStream(destCfg, false);
        connectProperties.store(fos, "for tests only!");
        fos.close();
    } catch (Exception e) {
        throw new RuntimeException("Unable to create the destination files", e);
    }
} 

}

这是我从 NetBeans 收到的错误消息:

Destination ABAP_AS_WITHOUT_POOL works
Execution on destination ABAP_AS_WITHOUT_POOL failed
com.sap.conn.jco.JCoException: (106) JCO_ERROR_RESOURCE: Destination 
    ABAP_AS_WITHOUT_POOL does not exist
at com.sap.conn.jco.rt.DefaultDestinationManager.update(DefaultDestinationManager.java:217)
at com.sap.conn.jco.rt.DefaultDestinationManager.searchDestination(DefaultDestinationManager.java:382)
at com.sap.conn.jco.rt.DefaultDestinationManager.getDestinationInstance(DefaultDestinationManager.java:100)
at com.sap.conn.jco.JCoDestinationManager.getDestination(JCoDestinationManager.java:104)
at jcotest2.CustomDestinationDataProvider.executeCalls(CustomDestinationDataProvider.java:92)
at jcotest2.Main.main(Main.java:39)
BUILD SUCCESSFUL (total time: 2 seconds)

Answer 1

看起来您的代码将登录数据保留在 HashMap“secureDBStorage”中。你在哪里填充这个HashMap？

另外:如果您使用的是 HashMap 而不是文件，您需要“createDestinationDataFile()”方法做什么？

编辑:由于这篇文章已被审核删除，我现在正在努力使其更加准确。所以你的代码有两个问题:

1. 您将后端系统的登录参数保存在名为“secureDBStorage”的 HashMap 中，但没有使用名为“ABAP_AS_WITHOUT_POOL”的系统/目标的参数填充此映射。

2. 您的代码仍然包含方法“createDestinationDataFile()”，该方法可能是从示例程序中复制的，然后忘记删除。由于您的程序使用 HashMap 来存储登录参数而不是文件系统，因此您可以删除此方法。 (只会混淆程序。)