使用 SAP Cloud SDK 3.0 版从 Java 调用 BAPI答案

【问题标题】：Calling BAPI from Java using SAP Cloud SDK version 3.0使用 SAP Cloud SDK 3.0 版从 Java 调用 BAPI
【发布时间】：2020-05-04 00:12:09
【问题描述】：

我目前正在开发一个 POC，我需要从使用 Java 的云应用程序中调用 S/4HANA On-Premise 内的 BAPI。为此，我正在使用 SAP Cloud SDK。

对于初始设置，我按照以下步骤操作： https://developers.sap.com/tutorials/s4sdk-setup.html

我正在尝试从我的应用程序中调用 BAPI_COSTCENTER_GETLIST1。这是代码sn-p：

final BapiRequestResult resultGetCostCenters = new BapiRequest("BAPI_COSTCENTER_GETLIST1")
 .withExporting("CONTROLLINGAREA", "BAPI0012_GEN-CO_AREA", "0001")
 .withTable("COSTCENTERLIST", "BAPI0012_CCLIST").end()
 .withTableAsReturn("BAPIRET2")
 .execute(destination);

这里是destination变量的声明：

Map<String, String> destinationProps = new HashMap<String, String>();
// Added a sample destination name. Solved NoSuchElementException error. 
destinationProps.put("Name", "SampleDestination");
destinationProps.put("URL", "<system_url>");
destinationProps.put("Type", "HTTP");
destinationProps.put("Password", "<system_password>");
destinationProps.put("Authentication", "BasicAuthentication");
destinationProps.put("User", "<system_user>");

final Destination destination= new DefaultDestination(destinationProps);

但是从execute() 开始，抛出一个异常，即java.util.NoSuchElementException: No value present。这是完整的堆栈跟踪

java.util.NoSuchElementException: No value present
    at io.vavr.control.Option$None.get(Option.java:526)
    at com.sap.cloud.sdk.s4hana.connectivity.rfc.SoapTransaction.before(SoapTransaction.java:56)
    at com.sap.cloud.sdk.s4hana.connectivity.rfc.RemoteFunctionRequestExecutor.execute(RemoteFunctionRequestExecutor.java:43)
    at com.sap.cloud.sdk.s4hana.connectivity.rfc.BapiRequest.execute(BapiRequest.java:78)
    at com.sap.csc.CostCenterCreationServlet.retrieveCostCenterList(CostCenterCreationServlet.java:73)
    at com.sap.csc.CostCenterCreationServlet.doGet(CostCenterCreationServlet.java:39)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:634)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at com.sap.cloud.sdk.cloudplatform.servlet.RequestAccessorFilter.lambda$doFilter$1(RequestAccessorFilter.java:71)
    at com.sap.cloud.sdk.cloudplatform.thread.AbstractThreadContextExecutor.lambda$execute$0(AbstractThreadContextExecutor.java:317)
    at com.sap.cloud.sdk.cloudplatform.thread.ThreadContextCallable.call(ThreadContextCallable.java:247)
    at com.sap.cloud.sdk.cloudplatform.thread.AbstractThreadContextExecutor.execute(AbstractThreadContextExecutor.java:319)
    at com.sap.cloud.sdk.cloudplatform.servlet.RequestAccessorFilter.doFilter(RequestAccessorFilter.java:71)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at com.sap.cloud.sdk.cloudplatform.security.servlet.HttpCachingHeaderFilter.doFilter(HttpCachingHeaderFilter.java:80)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at com.sap.cloud.sdk.cloudplatform.security.servlet.HttpSecurityHeadersFilter.doFilter(HttpSecurityHeadersFilter.java:41)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.apache.catalina.filters.RestCsrfPreventionFilter.doFilter(RestCsrfPreventionFilter.java:113)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:528)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
    at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:678)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
    at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:798)
    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:810)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1500)
    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
    at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.base/java.lang.Thread.run(Thread.java:835)

我认为我遗漏了一些非常基本的东西。或者我可能做错了。我找不到关于这个主题的任何有据可查的教程。所以请纠正我哪里出错了。

提前致谢。

（SAP Cloud SDK 概览页面 - https://help.sap.com/doc/0786ec6134c04c9bbafec959b6b737de/1.0/en-US/index.html）

Target host is not specified 异常的完整堆栈跟踪

com.sap.cloud.sdk.s4hana.connectivity.exception.RequestExecutionException: BapiRequest com.sap.csc.CostCenterCreationServlet.retrieveCostCenterList(CostCenterCreationServlet.java:69) failed [total: N/A, build payload: 0.243255s, execute request: N/A, parse response: N/A]
com.sap.cloud.sdk.s4hana.connectivity.rfc.exception.RemoteFunctionException: com.sap.cloud.sdk.s4hana.connectivity.exception.RequestExecutionException: BapiRequest com.sap.csc.CostCenterCreationServlet.retrieveCostCenterList(CostCenterCreationServlet.java:69) failed [total: N/A, build payload: 0.243255s, execute request: N/A, parse response: N/A]
    at com.sap.cloud.sdk.s4hana.connectivity.rfc.SoapTransaction.execute(SoapTransaction.java:70)
    at com.sap.cloud.sdk.s4hana.connectivity.rfc.RemoteFunctionRequestExecutor.execute(RemoteFunctionRequestExecutor.java:46)
    at com.sap.cloud.sdk.s4hana.connectivity.rfc.BapiRequest.execute(BapiRequest.java:78)
    at com.sap.csc.CostCenterCreationServlet.retrieveCostCenterList(CostCenterCreationServlet.java:73)
    at com.sap.csc.CostCenterCreationServlet.doGet(CostCenterCreationServlet.java:39)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:634)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at com.sap.cloud.sdk.cloudplatform.servlet.RequestAccessorFilter.lambda$doFilter$1(RequestAccessorFilter.java:71)
    at com.sap.cloud.sdk.cloudplatform.thread.AbstractThreadContextExecutor.lambda$execute$0(AbstractThreadContextExecutor.java:317)
    at com.sap.cloud.sdk.cloudplatform.thread.ThreadContextCallable.call(ThreadContextCallable.java:247)
    at com.sap.cloud.sdk.cloudplatform.thread.AbstractThreadContextExecutor.execute(AbstractThreadContextExecutor.java:319)
    at com.sap.cloud.sdk.cloudplatform.servlet.RequestAccessorFilter.doFilter(RequestAccessorFilter.java:71)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at com.sap.cloud.sdk.cloudplatform.security.servlet.HttpCachingHeaderFilter.doFilter(HttpCachingHeaderFilter.java:80)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at com.sap.cloud.sdk.cloudplatform.security.servlet.HttpSecurityHeadersFilter.doFilter(HttpSecurityHeadersFilter.java:41)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.apache.catalina.filters.RestCsrfPreventionFilter.doFilter(RestCsrfPreventionFilter.java:113)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:528)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
    at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:678)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
    at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:798)
    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:810)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1500)
    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
    at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.base/java.lang.Thread.run(Thread.java:835)
Caused by: com.sap.cloud.sdk.s4hana.connectivity.exception.RequestExecutionException: BapiRequest com.sap.csc.CostCenterCreationServlet.retrieveCostCenterList(CostCenterCreationServlet.java:69) failed [total: N/A, build payload: 0.243255s, execute request: N/A, parse response: N/A]
    at com.sap.cloud.sdk.s4hana.connectivity.ErpHttpRequestExecutor.execute(ErpHttpRequestExecutor.java:662)
    at com.sap.cloud.sdk.s4hana.connectivity.ErpHttpRequestExecutor.execute(ErpHttpRequestExecutor.java:410)
    at com.sap.cloud.sdk.s4hana.connectivity.rfc.SoapTransaction.execute(SoapTransaction.java:65)
    ... 44 more
Caused by: org.apache.http.client.ClientProtocolException
    at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:187)
    at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:83)
    at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:108)
    at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:56)
    at com.sap.cloud.sdk.cloudplatform.connectivity.HttpClientWrapper.execute(HttpClientWrapper.java:94)
    at com.sap.cloud.sdk.s4hana.connectivity.ErpHttpRequestExecutor.execute(ErpHttpRequestExecutor.java:646)
    ... 46 more
Caused by: org.apache.http.ProtocolException: Target host is not specified
    at org.apache.http.impl.conn.DefaultRoutePlanner.determineRoute(DefaultRoutePlanner.java:71)
    at org.apache.http.impl.client.InternalHttpClient.determineRoute(InternalHttpClient.java:125)
    at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:184)

【问题讨论】：

请添加您的NoSuchElementException 的堆栈跟踪。
什么是 POC？是 SAP 对象吗？
我猜他说的是概念验证。
堆栈跟踪已发布。

标签： sap bapi sap-cloud-sdk

【解决方案1】：

请在您的目的地属性中提供"Name" 条目，例如

destinationProps.put("Name", "<some_name>");

【讨论】：

嗨，Alexander，我认为部署应用程序时需要名称，它需要从云环境中获取目标详细信息（如 url、密码等）。但在这里我只在我的本地主机中运行它。那么在这种情况下我也需要一个名字吗？如果是，那么它可以是任何东西还是我需要在某个地方配置它？
是的，它是必需的。请告诉我们这是否能解决您的问题。
运行 BAPI 请求时，代码质量检查和审计日志记录需要目标名称。感谢您的发现，我们正在考虑改进此处的错误消息。
嗨亚历山大，NoSuchElement 异常现在在目的地中提供名称键后消失了。非常感谢您的帮助。但我仍然无法从 Java 调用 BAPI。现在这是一个不同的错误org.apache.http.ProtocolException: Target host is not specified。我尝试在 URL 的开头提供 http 或 https。但似乎仍然没有任何效果。虽然我是新手，但我认为调用 BAPI 不同于调用任何 HTTP API。这种情况下怎么处理？在上面的问题中添加完整的堆栈跟踪
@arunava04：很高兴听到NoSuchElementException 已解决。我可以请您就您的ProtocolException 提出另一个问题吗？