本文介绍了SAP JCO JAVA 无法初始化类 com.sap.conn.jco.JCo的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我想使用 SAP JCO 为我的 Java 程序选择用户数据.
i want to use SAP JCO to select user data for my java program.
但我得到的是:
Sep 23, 2014 1:34:28 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [StepByStepClient] in context with path [/Formularmanager-test] threw exception [Servlet execution threw an exception] with root cause
java.lang.NoClassDefFoundError: Could not initialize class com.sap.conn.jco.JCo
at com.sap.conn.jco.JCoDestinationManager.getDestination(JCoDestinationManager.java:61)
at com.pferd.itdienste.sap.StepByStepClient.step1Connect(StepByStepClient.java:125)
at com.pferd.itdienste.sap.StepByStepClient.processRequest(StepByStepClient.java:356)
at com.pferd.itdienste.sap.StepByStepClient.doGet(StepByStepClient.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1852)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
对于测试，我使用示例脚本StepByStepClient"，我只修改了它，所以我可以将它用作 Web servlet.
For a test i use the example script "StepByStepClient" and i have modify this only, so i can use it as an web servlet.
来自 sap jco 的所有文件都在C:\sapjco30P_11-10005326"上，我在系统 pfad 变量中注册了这个文件夹.
All files from sap jco are on "C:\sapjco30P_11-10005326" and i have this folder registered in the system pfad variable.
此时我不知道我的错误在哪里！所以我需要帮助，拜托！
At this moment i dont know where my error is! So i need help, please!
SAP Java 连接器Java 运行时操作系统:Windows Server 2012 6.2 for amd64Java VM:1.7.0_60 Oracle Corporation默认字符集:windows-1252
SAP Java ConnectorJava RuntimeOperating System: Windows Server 2012 6.2 for amd64Java VM: 1.7.0_60 Oracle CorporationDefault charset: windows-1252
版本
- JCo API:3.0.11 (2014-04-15)
- JCo 中间件:JavaRfc 2.2.12
- JCo 库:720.612
库路径
- JCo 存档路径:C:\sapjco30P_11-10005326\sapjco3.jar
- JCo 库的路径:C:\sapjco30P_11-10005326\sapjco3.dll
日食朱诺XAMPP Tomcat 7
Eclipse JunoXAMPP Tomcat 7
package com.pferd.itdienste.sap;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Properties;
import java.util.concurrent.CountDownLatch;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.sap.conn.jco.AbapException;
import com.sap.conn.jco.JCoContext;
import com.sap.conn.jco.JCoDestination;
import com.sap.conn.jco.JCoDestinationManager;
import com.sap.conn.jco.JCoException;
import com.sap.conn.jco.JCoField;
import com.sap.conn.jco.JCoFunction;
import com.sap.conn.jco.JCoFunctionTemplate;
import com.sap.conn.jco.JCoStructure;
import com.sap.conn.jco.JCoTable;
import com.sap.conn.jco.ext.DestinationDataProvider;
@WebServlet(name = "StepByStepClient", urlPatterns = {"/StepByStepClient"})
public class StepByStepClient extends HttpServlet
{
static String ABAP_AS = "ABAP_AS_WITHOUT_POOL";
static String ABAP_AS_POOLED = "ABAP_AS_WITH_POOL";
static String ABAP_MS = "ABAP_MS_WITHOUT_POOL";
static
{
Properties connectProperties = new Properties();
connectProperties.setProperty(DestinationDataProvider.JCO_ASHOST, "HOST");
connectProperties.setProperty(DestinationDataProvider.JCO_SYSNR, "01");
connectProperties.setProperty(DestinationDataProvider.JCO_CLIENT, "200");
connectProperties.setProperty(DestinationDataProvider.JCO_USER, "USER");
connectProperties.setProperty(DestinationDataProvider.JCO_PASSWD, "PASSWORD");
connectProperties.setProperty(DestinationDataProvider.JCO_LANG, "en");
createDataFile(ABAP_AS, "jcoDestination", connectProperties);
connectProperties.setProperty(DestinationDataProvider.JCO_POOL_CAPACITY, "3");
connectProperties.setProperty(DestinationDataProvider.JCO_PEAK_LIMIT, "10");
createDataFile(ABAP_AS_POOLED, "jcoDestination", connectProperties);
connectProperties.clear();
connectProperties.setProperty(DestinationDataProvider.JCO_MSHOST, "HOST");
connectProperties.setProperty(DestinationDataProvider.JCO_R3NAME, "SID");
connectProperties.setProperty(DestinationDataProvider.JCO_CLIENT, "200");
connectProperties.setProperty(DestinationDataProvider.JCO_USER, "USER");
connectProperties.setProperty(DestinationDataProvider.JCO_PASSWD, "PASSWORD");
connectProperties.setProperty(DestinationDataProvider.JCO_GROUP, "GROUP");
connectProperties.setProperty(DestinationDataProvider.JCO_LANG, "en");
createDataFile(ABAP_MS, "jcoDestination", connectProperties);
}
/**
* Handles the HTTP <code>GET</code> method.
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
try {
processRequest(request, response);
} catch (JCoException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/**
* Handles the HTTP <code>POST</code> method.
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
try {
processRequest(request, response);
} catch (JCoException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/**
* Returns a short description of the servlet.
* @return a String containing servlet description
*/
@Override
public String getServletInfo() {
return "Short description";
}// </editor-fold>
static void createDataFile(String name, String suffix, Properties properties)
{
File cfg = new File(name+"."+suffix);
if(!cfg.exists())
{
try
{
FileOutputStream fos = new FileOutputStream(cfg, false);
properties.store(fos, "for tests only !");
fos.close();
}
catch (Exception e)
{
throw new RuntimeException("Unable to create the destination file " + cfg.getName(), e);
}
}
}
public static void step1Connect() throws JCoException
{
JCoDestination destination = JCoDestinationManager.getDestination(ABAP_AS);
System.out.println("Attributes:");
System.out.println(destination.getAttributes());
System.out.println();
destination = JCoDestinationManager.getDestination(ABAP_MS);
System.out.println("Attributes:");
System.out.println(destination.getAttributes());
System.out.println();
}
public static void step2ConnectUsingPool() throws JCoException
{
JCoDestination destination = JCoDestinationManager.getDestination(ABAP_AS_POOLED);
destination.ping();
System.out.println("Attributes:");
System.out.println(destination.getAttributes());
System.out.println();
}
public static void step3SimpleCall() throws JCoException
{
JCoDestination destination = JCoDestinationManager.getDestination(ABAP_AS_POOLED);
JCoFunction function = destination.getRepository().getFunction("STFC_CONNECTION");
if(function == null)
throw new RuntimeException("BAPI_COMPANYCODE_GETLIST not found in SAP.");
function.getImportParameterList().setValue("REQUTEXT", "Hello SAP");
try
{
function.execute(destination);
}
catch(AbapException e)
{
System.out.println(e.toString());
return;
}
System.out.println("STFC_CONNECTION finished:");
System.out.println(" Echo: " + function.getExportParameterList().getString("ECHOTEXT"));
System.out.println(" Response: " + function.getExportParameterList().getString("RESPTEXT"));
System.out.println();
}
public static void step3WorkWithStructure() throws JCoException
{
JCoDestination destination = JCoDestinationManager.getDestination(ABAP_AS_POOLED);
JCoFunction function = destination.getRepository().getFunction("RFC_SYSTEM_INFO");
if(function == null)
throw new RuntimeException("RFC_SYSTEM_INFO not found in SAP.");
try
{
function.execute(destination);
}
catch(AbapException e)
{
System.out.println(e.toString());
return;
}
JCoStructure exportStructure = function.getExportParameterList().getStructure("RFCSI_EXPORT");
System.out.println("System info for " + destination.getAttributes().getSystemID() + ":\n");
for(int i = 0; i < exportStructure.getMetaData().getFieldCount(); i++)
{
System.out.println(exportStructure.getMetaData().getName(i) + ":\t" + exportStructure.getString(i));
}
System.out.println();
//JCo still supports the JCoFields, but direct access via getXX is more efficient as field iterator
System.out.println("The same using field iterator: \nSystem info for " + destination.getAttributes().getSystemID() + ":\n");
for(JCoField field : exportStructure)
{
System.out.println(field.getName() + ":\t" + field.getString());
}
System.out.println();
}
public static void step4WorkWithTable() throws JCoException
{
JCoDestination destination = JCoDestinationManager.getDestination(ABAP_AS_POOLED);
JCoFunction function = destination.getRepository().getFunction("BAPI_COMPANYCODE_GETLIST");
if(function == null)
throw new RuntimeException("BAPI_COMPANYCODE_GETLIST not found in SAP.");
try
{
function.execute(destination);
}
catch(AbapException e)
{
System.out.println(e.toString());
return;
}
JCoStructure returnStructure = function.getExportParameterList().getStructure("RETURN");
if (! (returnStructure.getString("TYPE").equals("")||returnStructure.getString("TYPE").equals("S")) )
{
throw new RuntimeException(returnStructure.getString("MESSAGE"));
}
JCoTable codes = function.getTableParameterList().getTable("COMPANYCODE_LIST");
for (int i = 0; i < codes.getNumRows(); i++)
{
codes.setRow(i);
System.out.println(codes.getString("COMP_CODE") + '\t' + codes.getString("COMP_NAME"));
}
codes.firstRow();
for (int i = 0; i < codes.getNumRows(); i++, codes.nextRow())
{
function = destination.getRepository().getFunction("BAPI_COMPANYCODE_GETDETAIL");
if (function == null)
throw new RuntimeException("BAPI_COMPANYCODE_GETDETAIL not found in SAP.");
function.getImportParameterList().setValue("COMPANYCODEID", codes.getString("COMP_CODE"));
function.getExportParameterList().setActive("COMPANYCODE_ADDRESS",false);
try
{
function.execute(destination);
}
catch (AbapException e)
{
System.out.println(e.toString());
return;
}
returnStructure = function.getExportParameterList().getStructure("RETURN");
if (! (returnStructure.getString("TYPE").equals("") ||
returnStructure.getString("TYPE").equals("S") ||
returnStructure.getString("TYPE").equals("W")) )
{
throw new RuntimeException(returnStructure.getString("MESSAGE"));
}
JCoStructure detail = function.getExportParameterList().getStructure("COMPANYCODE_DETAIL");
System.out.println(detail.getString("COMP_CODE") + '\t' +
detail.getString("COUNTRY") + '\t' +
detail.getString("CITY"));
}//for
}
/**
* this example shows the "simple" stateful call sequence. Since all calls belonging to one
* session are executed within the same thread, the application does not need
* to take care about the SessionReferenceProvider. MultithreadedExample.java
* illustrates the more complex scenario, where the calls belonging to one session are
* executed from different threads.
*
* Note: this example uses Z_GET_COUNTER and Z_INCREMENT_COUNTER. The most ABAP systems
* contain function modules GET_COUNTER and INCREMENT_COUNTER, that are not remote enabled.
* Copy these functions to Z_GET_COUNTER and Z_INCREMENT_COUNTER (or implement as wrapper)
* and mark they remote enabled
* @throws JCoException
*/
public static void step4SimpleStatefulCalls() throws JCoException
{
final JCoFunctionTemplate incrementCounterTemplate, getCounterTemplate;
JCoDestination destination = JCoDestinationManager.getDestination(ABAP_MS);
incrementCounterTemplate = destination.getRepository().getFunctionTemplate("Z_INCREMENT_COUNTER");
getCounterTemplate = destination.getRepository().getFunctionTemplate("Z_GET_COUNTER");
if(incrementCounterTemplate == null || getCounterTemplate == null)
throw new RuntimeException("This example cannot run without Z_INCREMENT_COUNTER and Z_GET_COUNTER functions");
final int threadCount = 5;
final int loops = 5;
final CountDownLatch startSignal = new CountDownLatch(threadCount);
final CountDownLatch doneSignal = new CountDownLatch(threadCount);
Runnable worker = new Runnable()
{
public void run()
{
startSignal.countDown();
try
{
//wait for other threads
startSignal.await();
JCoDestination dest = JCoDestinationManager.getDestination(ABAP_MS);
JCoContext.begin(dest);
try
{
for(int i=0; i < loops; i++)
{
JCoFunction incrementCounter = incrementCounterTemplate.getFunction();
incrementCounter.execute(dest);
}
JCoFunction getCounter = getCounterTemplate.getFunction();
getCounter.execute(dest);
int remoteCounter = getCounter.getExportParameterList().getInt("GET_VALUE");
System.out.println("Thread-" + Thread.currentThread().getId() +
" finished. Remote counter has " + (loops==remoteCounter?"correct":"wrong") +
" value [" + remoteCounter + "]");
}
finally
{
JCoContext.end(dest);
}
}
catch(Exception e)
{
System.out.println("Thread-" + Thread.currentThread().getId() + " ends with exception " + e.toString());
}
doneSignal.countDown();
}
};
for(int i = 0; i < threadCount; i++)
{
new Thread(worker).start();
}
try
{
doneSignal.await();
}
catch(Exception e)
{
}
}
protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws JCoException
{
step1Connect();
step2ConnectUsingPool();
step3SimpleCall();
step4WorkWithTable();
step4SimpleStatefulCalls();
}
}
推荐答案
正如前面所说，JCo jar 文件在执行过程中无法访问.
我认为你可以把jar(和dll)放在你的webapp的webinf/lib目录下，或者如果有几个app可以使用lib，则将它们放在Tomcat的common lib目录中.
As it is said, the JCo jar file is not accessible during execution.
I think that you you can put the jar (and dll) under the webinf/lib directory of your webapp, or put them in the common lib directory of Tomcat if several app can use the lib.
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