我在WebSphere Application Server 8.5上为RHEL6 (x64)部署了两个web应用程序。这两个web应用程序都使用SAP JCo库连接到部署在SAP ECC6中的BAPI。为了创建Purchase Requests，两个应用程序都需要访问相同的BAPI。因此，我们使用从SAP的CustomDestinationDataProvider修改的相同代码进行连接。为了确保应用程序只注册它一次，我们使用Spring使它成为单例。
但是，当应用程序启动时，当执行com.sap.conn.jco.ext.Environment.registerDestinationDataProvider(myProvider)时，一个应用程序(我们猜测它是在第一个应用程序之后加载的)遇到这个错误
. lang。非法状态异常:DestinationDataProvider已经注册
CustomDestinationDataProvider如下:
public class CustomDestinationDataProvider {
public CustomDestinationDataProvider () {
}
public static BapiConfigBean bapiConfigBean;
//The custom destination data provider implements DestinationDataProvider and
//provides an implementation for at least getDestinationProperties(String).
//Whenever possible the implementation should support events and notify the JCo runtime
//if a destination is being created, changed, or deleted. Otherwise JCo runtime
//will check regularly if a cached destination configuration is still valid which incurs
//a performance penalty.
public static class MyDestinationDataProvider implements DestinationDataProvider
{
private DestinationDataEventListener eL;
private HashMap<String, Properties> secureDBStorage = new HashMap<String, Properties>();
public MyDestinationDataProvider () {
}
public Properties getDestinationProperties(String destinationName)
{
try
{
//read the destination from DB
Properties p = secureDBStorage.get(destinationName);
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 destName, Properties properties)
{
synchronized(secureDBStorage)
{
if(properties==null)
{
if(secureDBStorage.remove(destName)!=null)
eL.deleted(destName);
}
else
{
secureDBStorage.put(destName, properties);
eL.updated(destName); // create or updated
}
}
}
public void removeDestination(String destName) {
// TODO Auto-generated method stub
}
public void addDestination(String destName,
MyDestinationDataProvider myProvider) {
// TODO Auto-generated method stub
}
} // end of MyDestinationDataProvider
//business logic
void executeCalls(String destName)
{
JCoDestination dest;
try
{
dest = JCoDestinationManager.getDestination(destName);
dest.ping();
System.out.println("Destination " + destName + " works");
}
catch(JCoException e)
{
e.printStackTrace();
System.out.println("Execution on destination " + destName+ " failed");
}
}
static Properties getDestinationPropertiesFromUI()
{
//adapt parameters in order to configure a valid destination
Properties connectProperties = new Properties();
connectProperties.setProperty(DestinationDataProvider.JCO_ASHOST, getBapiConfigBean().getServerIp());
connectProperties.setProperty(DestinationDataProvider.JCO_SYSNR, getBapiConfigBean().getSystemNumber());
connectProperties.setProperty(DestinationDataProvider.JCO_CLIENT, getBapiConfigBean().getClientId());
connectProperties.setProperty(DestinationDataProvider.JCO_USER, getBapiConfigBean().getUserName());
connectProperties.setProperty(DestinationDataProvider.JCO_PASSWD, getBapiConfigBean().getUserPassword());
connectProperties.setProperty(DestinationDataProvider.JCO_LANG, getBapiConfigBean().getClientLang());
return connectProperties;
}
static MyDestinationDataProvider myProvider = null; //2014-06-30 00:30
public static void initProvider(BapiConfigBean bapiConfigBean) {
CustomDestinationDataProvider.destroy();
setBapiConfigBean(bapiConfigBean);
myProvider = new MyDestinationDataProvider();
String destName = getBapiConfigBean().getSapDestname();
try
{
com.sap.conn.jco.ext.Environment.registerDestinationDataProvider(myProvider);
CustomDestinationDataProvider test = new CustomDestinationDataProvider();
myProvider.changeProperties(destName, getDestinationPropertiesFromUI());
test.executeCalls(destName);
}
catch(IllegalStateException providerAlreadyRegisteredException)
{
try {
JCoDestination jcodest = JCoDestinationManager.getDestination(getBapiConfigBean().getSapDestname());
} catch (JCoException exJCo) {
//TODO: Add exception handling and send friendly message to ui
}
}
}
public static BapiConfigBean getBapiConfigBean() {
return bapiConfigBean;
}
public static void setBapiConfigBean(BapiConfigBean bapiConfigBean) {
CustomDestinationDataProvider.bapiConfigBean = bapiConfigBean;
}
public static void destroy() {
try {
Environment.unregisterDestinationDataProvider(myProvider);
System.out.println("Unregistered connection to SAP");
} catch (IllegalStateException e) {
System.out.println("Failed to unregister connection to SAP: "+ e);
}
}
}
SystemOut.log在WebSphere中的错误如下:
[6/30/14 22:29:15:198 ICT] 00000043 webapp
E com.ibm.ws.webcontainer.webapp.WebApp notifyServletContextCreated SRVE0283E: Exception
caught while initializing context: {0}
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'jdoConnector'
defined in ServletContext resource [/WEB-INF/applicationContext-BAPI.xml]: Instantiation of bean
failed; nested exception is org.springframework.beans.BeanInstantiationException:
Could not instantiate bean class [com.sps.tmps.bean.bapi.JCOConnector]: Constructor threw exception;
nested exception is java.lang.Error: java.lang.IllegalStateException: DestinationDataProvider already
registered [com.sps.tmps.bean.bapi.CustomDestinationDataProvider$MyDestinationDataProvider]
Caused by: org.springframework.beans.BeanInstantiationException: Could not instantiate bean
class [com.sps.tmps.bean.bapi.JCOConnector]: Constructor threw exception; nested exception
is java.lang.Error: java.lang.IllegalStateException: DestinationDataProvider already registered
[com.sps.tmps.bean.bapi.CustomDestinationDataProvider$MyDestinationDataProvider]
Caused by: java.lang.Error: java.lang.IllegalStateException: DestinationDataProvider
already registered [com.sps.tmps.bean.bapi.CustomDestinationDataProvider$MyDestinationDataProvider]
at com.sps.tmps.bean.bapi.CustomDestinationDataProvider.initProvider(CustomDestinationDataProvider.java:174)
at com.sps.tmps.bean.bapi.JCOConnector.<init>(JCOConnector.java:41)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:56)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:39)
at java.lang.reflect.Constructor.newInstance(Constructor.java:527)
at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:85)
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:87)
at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:186)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:800)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:720)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:387)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:251)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:156)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:248)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:160)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:287)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:352)
at org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:244)
at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:187)
at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:49)
at com.ibm.ws.webcontainer.webapp.WebApp.notifyServletContextCreated(WebApp.java:1678)
at com.ibm.ws.webcontainer.webapp.WebAppImpl.initialize(WebAppImpl.java:414)
at com.ibm.ws.webcontainer.webapp.WebGroupImpl.addWebApplication(WebGroupImpl.java:88)
at com.ibm.ws.webcontainer.VirtualHostImpl.addWebApplication(VirtualHostImpl.java:169)
at com.ibm.ws.webcontainer.WSWebContainer.addWebApp(WSWebContainer.java:749)
at com.ibm.ws.webcontainer.WSWebContainer.addWebApplication(WSWebContainer.java:634)
at com.ibm.ws.webcontainer.component.WebContainerImpl.install(WebContainerImpl.java:426)
at com.ibm.ws.webcontainer.component.WebContainerImpl.start(WebContainerImpl.java:718)
at com.ibm.ws.runtime.component.ApplicationMgrImpl.start(ApplicationMgrImpl.java:1175)
at com.ibm.ws.runtime.component.DeployedApplicationImpl.fireDeployedObjectStart(DeployedApplicationImpl.java:1370)
at com.ibm.ws.runtime.component.DeployedModuleImpl.start(DeployedModuleImpl.java:639)
at com.ibm.ws.runtime.component.DeployedApplicationImpl.start(DeployedApplicationImpl.java:968)
at com.ibm.ws.runtime.component.ApplicationMgrImpl.startApplication(ApplicationMgrImpl.java:774)
at com.ibm.ws.runtime.component.ApplicationMgrImpl.start(ApplicationMgrImpl.java:2182)
at com.ibm.ws.runtime.component.CompositionUnitMgrImpl.start(CompositionUnitMgrImpl.java:445)
at com.ibm.ws.runtime.component.CompositionUnitImpl.start(CompositionUnitImpl.java:123)
at com.ibm.ws.runtime.component.CompositionUnitMgrImpl.start(CompositionUnitMgrImpl.java:388)
at com.ibm.ws.runtime.component.CompositionUnitMgrImpl.access$500(CompositionUnitMgrImpl.java:116)
at com.ibm.ws.runtime.component.CompositionUnitMgrImpl$CUInitializer.run(CompositionUnitMgrImpl.java:994)
at com.ibm.wsspi.runtime.component.WsComponentImpl$_AsynchInitializer.run(WsComponentImpl.java:502)
at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1862)
Caused by: java.lang.IllegalStateException: DestinationDataProvider already registered
[com.sps.tmps.bean.bapi.CustomDestinationDataProvider$MyDestinationDataProvider]
at com.sap.conn.jco.rt.RuntimeEnvironment.setDestinationDataProvider(RuntimeEnvironment.java:134)
at com.sap.conn.jco.ext.Environment.registerDestinationDataProvider(Environment.java:259)
at com.sps.tmps.bean.bapi.CustomDestinationDataProvider.initProvider(CustomDestinationDataProvider.java:156)
... 41 more
我的问题是:
- 如何使两个应用程序能够使用相同的
CustomDestinationDataProvider? - 如果两个应用程序不能使用相同的提供商，我如何使用相同的服务器/用户/客户端号访问相同的BAPI ?
在这种情况下的约束是(1)我们应该使用SAP JCo和(2)我们只有一个BAPI函数。如果您认为customDestinationDataProvider有问题，可以丢弃。
顺便说一下，我为冗长的代码和糟糕的格式道歉。
谢谢。
这个问题的一个简单解决方案是为两个应用程序使用不同的目标名称(尽管它们在您的情况下是相同的)。使用两个不同的目标名称，每个应用程序一个。例如PROD_APP1, PROD_APP2
我相信其他一切都可以保持不变。
在理想的情况下，我更喜欢一个更健壮的解决方案。可能是我认为在自定义类加载器等行
祝你好运!