使用paypal api时无法建立SOAP连接

我正在尝试使用paypal soap客户端，并使用Paypal Express Checkout和Java参考执行setExpressCheckout方法。

所以这里我只使用paypal-base.jar和paypal-stubs.jar而不是soap客户端（从wsdl生成）。

public class SetExpressCheckoutService{ private static Logger log = Logger.getLogger(SetExpressCheckoutService.class); public static void main(String[] args){ SetExpressCheckoutService setExpressCheckoutService = new SetExpressCheckoutService(); //the parameters for the service Long userId = 5l; String amount = "25"; String returnURL = "http://localhost:8080/integratingstuff-paypal/return_after_payment.xhtml"; String cancelURL = "http://localhost:8080/integratingstuff-paypal/cancel_payment.xhtml"; PaymentActionCodeType paymentAction = PaymentActionCodeType.Sale; CurrencyCodeType currencyCode = CurrencyCodeType.EUR; try { //calling the service, setting up the checkoutpage String token = setExpressCheckoutService.setExpressCheckout(userId, amount, currencyCode, returnURL,cancelURL,paymentAction); log.info("Url to redirect to: https://www.sandbox.paypal.com/webscr?cmd=_express-checkout&useraction=commit&token=" + token); } catch (PayPalException e) { log.error(e); } } public String setExpressCheckout(Long userId, String paymentAmount, CurrencyCodeType currencyCodeType, String returnURL, String cancelURL, PaymentActionCodeType paymentAction) throws PayPalException{ CallerServices caller = new CallerServices(); //construct and set the profile, these are the credentials we establish as "the shop" with Paypal APIProfile profile = ProfileFactory.createSignatureAPIProfile(); profile.setAPIUsername("sdk-three_api1.sdk.com"); profile.setAPIPassword("QFZCWN5HZM8VBG7Q"); profile.setSignature("AVGidzoSQiGWu.lGj3z15HLczXaaAcK6imHawrjefqgclVwBe8imgCHZ"); profile.setEnvironment("sandbox"); caller.setAPIProfile(profile); //construct the request SetExpressCheckoutRequestType pprequest = new SetExpressCheckoutRequestType(); pprequest.setVersion("63.0"); //construct the details for the request SetExpressCheckoutRequestDetailsType details = new SetExpressCheckoutRequestDetailsType(); PaymentDetailsType paymentDetails = new PaymentDetailsType(); paymentDetails.setOrderDescription("Integrating Stuff Test Order"); paymentDetails.setInvoiceID("INVOICE-" + Math.random()); BasicAmountType orderTotal = new BasicAmountType(paymentAmount); orderTotal.setCurrencyID(currencyCodeType); paymentDetails.setOrderTotal(orderTotal); paymentDetails.setPaymentAction(paymentAction); details.setPaymentDetails(new PaymentDetailsType[]{paymentDetails}); details.setReturnURL(returnURL); details.setCancelURL(cancelURL); details.setCustom(userId.toString()); //set the details on the request pprequest.setSetExpressCheckoutRequestDetails(details); //call the actual webservice, passing the constructed request SetExpressCheckoutResponseType ppresponse = (SetExpressCheckoutResponseType) caller.call("SetExpressCheckout", pprequest); //get the token from the response return ppresponse.getToken(); } } 

我试图执行此方法，但我得到例外
com.paypal.sdk.exceptions.FatalException: Unable to establish SOAP connection

引起：com.paypal.sdk.core.APICallerBase.getEndpointUrl（APICallerBase.java:296）中的java.lang.NullPointerException

完整的堆栈跟踪是：

 com.paypal.sdk.exceptions.FatalException: Unable to establish SOAP connection at com.paypal.sdk.core.soap.SOAPAPICaller.setupConnection(SOAPAPICaller.java:292) at com.paypal.sdk.services.CallerServices.setAPIProfile(CallerServices.java:112) at com.imedicor.liferay.organizations.util.PaypalService.setExpressCheckout(PaypalService.java:92) at com.imedicor.liferay.organizations.util.PaypalService.testing(PaypalService.java:43) at org.apache.jsp.organization_005fdetails_jsp._jspService(organization_005fdetails_jsp.java:500) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) at javax.servlet.http.HttpServlet.service(HttpServlet.java:722) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334) at javax.servlet.http.HttpServlet.service(HttpServlet.java:722) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:72) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilter.doFilter(InvokerFilter.java:73) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:684) at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:593) at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:530) at com.liferay.portlet.PortletRequestDispatcherImpl.dispatch(PortletRequestDispatcherImpl.java:323) at com.liferay.portlet.PortletRequestDispatcherImpl.include(PortletRequestDispatcherImpl.java:134) at com.imedicor.liferay.organizations.portlet.OrganizationPortlet.doView(OrganizationPortlet.java:83) at com.liferay.portal.kernel.portlet.LiferayPortlet.doDispatch(LiferayPortlet.java:218) at com.liferay.util.bridges.mvc.MVCPortlet.doDispatch(MVCPortlet.java:319) at javax.portlet.GenericPortlet.render(GenericPortlet.java:233) at com.liferay.portlet.FilterChainImpl.doFilter(FilterChainImpl.java:100) at com.liferay.portal.kernel.portlet.PortletFilterUtil.doFilter(PortletFilterUtil.java:64) at com.liferay.portal.kernel.servlet.PortletServlet.service(PortletServlet.java:111) at javax.servlet.http.HttpServlet.service(HttpServlet.java:722) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:72) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilter.doFilter(InvokerFilter.java:73) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:684) at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:593) at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:530) at com.liferay.portlet.InvokerPortletImpl.invoke(InvokerPortletImpl.java:534) at com.liferay.portlet.InvokerPortletImpl.invokeRender(InvokerPortletImpl.java:607) at com.liferay.portlet.InvokerPortletImpl.render(InvokerPortletImpl.java:359) at org.apache.jsp.html.portal.render_005fportlet_jsp._jspService(render_005fportlet_jsp.java:1207) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) at javax.servlet.http.HttpServlet.service(HttpServlet.java:722) at com.liferay.portal.servlet.DirectRequestDispatcher.include(DirectRequestDispatcher.java:97) at com.liferay.portal.servlet.PACLRequestDispatcherWrapper.doDispatch(PACLRequestDispatcherWrapper.java:90) at com.liferay.portal.servlet.PACLRequestDispatcherWrapper.include(PACLRequestDispatcherWrapper.java:54) at com.liferay.portal.util.PortalImpl.renderPortlet(PortalImpl.java:5158) at com.liferay.portal.util.PortalUtil.renderPortlet(PortalUtil.java:1569) at com.liferay.portlet.layoutconfiguration.util.RuntimePortletImpl.processPortlet(RuntimePortletImpl.java:165) at com.liferay.portlet.layoutconfiguration.util.RuntimePortletImpl.processPortlet(RuntimePortletImpl.java:203) at com.liferay.portlet.layoutconfiguration.util.RuntimePortletImpl.processPortlet(RuntimePortletImpl.java:190) at com.liferay.portlet.layoutconfiguration.util.RuntimePortletUtil.processPortlet(RuntimePortletUtil.java:87) at com.liferay.portlet.layoutconfiguration.util.velocity.TemplateProcessor.processMax(TemplateProcessor.java:165) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.doInvoke(UberspectImpl.java:389) at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:378) at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:270) at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:262) at org.apache.velocity.runtime.parser.node.ASTReference.render(ASTReference.java:342) at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:336) at org.apache.velocity.Template.merge(Template.java:328) at org.apache.velocity.Template.merge(Template.java:235) at org.apache.velocity.app.VelocityEngine.mergeTemplate(VelocityEngine.java:381) at com.liferay.portal.velocity.VelocityEngineImpl.mergeTemplate(VelocityEngineImpl.java:264) at com.liferay.portal.kernel.velocity.VelocityEngineUtil.mergeTemplate(VelocityEngineUtil.java:73) at com.liferay.portlet.layoutconfiguration.util.RuntimePortletImpl.doProcessTemplate(RuntimePortletImpl.java:499) at com.liferay.portlet.layoutconfiguration.util.RuntimePortletImpl.doDispatch(RuntimePortletImpl.java:394) at com.liferay.portlet.layoutconfiguration.util.RuntimePortletImpl.processTemplate(RuntimePortletImpl.java:228) at com.liferay.portlet.layoutconfiguration.util.RuntimePortletUtil.processTemplate(RuntimePortletUtil.java:125) at org.apache.jsp.html.portal.layout.view.control_005fpanel_jsp._jspService(control_005fpanel_jsp.java:676) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) at javax.servlet.http.HttpServlet.service(HttpServlet.java:722) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334) at javax.servlet.http.HttpServlet.service(HttpServlet.java:722) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:72) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilter.doFilter(InvokerFilter.java:73) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:684) at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:593) at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:530) at com.liferay.portal.action.LayoutAction.includeLayoutContent(LayoutAction.java:468) at com.liferay.portal.action.LayoutAction.processLayout(LayoutAction.java:735) at com.liferay.portal.action.LayoutAction.execute(LayoutAction.java:249) at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:431) at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236) at com.liferay.portal.struts.PortalRequestProcessor.process(PortalRequestProcessor.java:187) at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196) at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414) at javax.servlet.http.HttpServlet.service(HttpServlet.java:621) at com.liferay.portal.servlet.MainServlet.callParentService(MainServlet.java:560) at com.liferay.portal.servlet.MainServlet.service(MainServlet.java:537) at javax.servlet.http.HttpServlet.service(HttpServlet.java:722) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:72) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116) at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:163) at com.liferay.portal.servlet.filters.secure.SecureFilter.processFilter(SecureFilter.java:294) at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:57) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:206) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:108) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilter.doFilter(InvokerFilter.java:73) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:684) at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:471) at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:402) at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:329) at com.liferay.portal.servlet.FriendlyURLServlet.service(FriendlyURLServlet.java:138) at javax.servlet.http.HttpServlet.service(HttpServlet.java:722) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:72) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116) at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:163) at com.liferay.portal.servlet.filters.strip.StripFilter.processFilter(StripFilter.java:335) at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:57) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:206) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:108) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116) at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:163) at com.liferay.portal.servlet.filters.gzip.GZipFilter.processFilter(GZipFilter.java:123) at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:57) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:206) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:108) at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:163) at com.liferay.portal.servlet.filters.secure.SecureFilter.processFilter(SecureFilter.java:294) at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:57) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:206) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:108) at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:163) at com.liferay.portal.servlet.filters.i18n.I18nFilter.processFilter(I18nFilter.java:241) at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:57) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:206) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:108) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116) at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:163) at com.liferay.portal.servlet.filters.etag.ETagFilter.processFilter(ETagFilter.java:56) at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:57) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:206) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:108) at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:163) at com.liferay.portal.servlet.filters.autologin.AutoLoginFilter.processFilter(AutoLoginFilter.java:246) at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:57) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:206) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:108) at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:163) at com.liferay.portal.servlet.filters.sso.ntlm.NtlmPostFilter.processFilter(NtlmPostFilter.java:83) at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:57) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:206) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:108) at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:163) at com.liferay.portal.sharepoint.SharepointFilter.processFilter(SharepointFilter.java:80) at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:57) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:206) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:108) at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:163) at com.liferay.portal.servlet.filters.virtualhost.VirtualHostFilter.processFilter(VirtualHostFilter.java:216) at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:57) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:206) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:108) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDirectCallFilter(InvokerFilterChain.java:187) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:95) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116) at org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:738) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:206) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:108) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDirectCallFilter(InvokerFilterChain.java:167) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:95) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDirectCallFilter(InvokerFilterChain.java:167) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:95) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDirectCallFilter(InvokerFilterChain.java:187) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:95) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilter.doFilter(InvokerFilter.java:73) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:225) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:999) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:565) at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:309) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) at java.lang.Thread.run(Thread.java:619) Caused by: java.lang.NullPointerException at com.paypal.sdk.core.APICallerBase.getEndpointUrl(APICallerBase.java:296) at com.paypal.sdk.core.soap.SOAPAPICaller.setupConnection(SOAPAPICaller.java:193) 

所以我因为没有设置终点url而得到这个例外？

在这种情况下如何设置端点url？

我也尝试在上面的方法启动时以下列方式添加端点配置。

 Map sdkConfig = new HashMap(); sdkConfig.put("mode", "sandbox"); sdkConfig.put("acct1.UserName", "sdk-three_api1.sdk.com"); sdkConfig.put("acct1.Password", "QFZCWN5HZM8VBG7Q"); sdkConfig.put("acct1.Signature","AVGidzoSQiGWu.lGj3z15HLczXaaAcK6imHawrjefqgclVwBe8imgCHZ"); PayPalAPIInterfaceServiceService service = new PayPalAPIInterfaceServiceService(sdkConfig); 

但我仍然得到同样的例外。

请在这方面指导我。

谢谢，

Answer 1

好吧，所以我没有设法找出为什么CallerService抛出提到的exception，因为即使在反编译提到paypal_base.jar ，代码也非常繁琐，并且很难找到引擎盖下发生的事情。 看起来它已经过时了，因为除了几个地方我无法在网上的任何地方找到对这个JAR的引用。

但我真的建议你坚持使用PayPal提供的原始文档。 我试过自己，这就是我发现的：

1. 按照提到的文章中的Paypal API SDK和下载链接，然后单击Classic APIs类别下的Merchant链接（如果您在网上挖掘，您会发现PayPal Merchant API应该用于ExpressCheckout请求）。 单击上面的Java按钮，使用Maven （首选）或仅使用页面底部的下载链接下载SDK。

2. 将下载的JAR添加到您的项目中并删除其他PayPal JAR，因为下载的Merchant API jar应包含所有必需的类。

3. 现在一切都在猜测:)所以在上面的代码片段中你已经形成了SetExpressCheckoutRequestType实例，你需要some invocation code来获取SetExpressCheckoutRequestType的实例并返回SetExpressCheckoutResponseType实例。
4. 我在Eclipse中使用了functionSearch -> References -> Workspace来查找在Merchant API jar中使用SetExpressCheckoutRequestType位置。 这个搜索显示（除了其他地方）有一个名为SetExpressCheckoutReq类，它有方法setSetExpressCheckoutRequest(SetExpressCheckoutRequestType)
5. 然后我再次使用搜索function搜索SetExpressCheckoutReq类的用法，发现有类PayPalAPIInterfaceServiceService ，方法为setExpressCheckout(SetExpressCheckoutReq setExpressCheckoutReq) ，返回所需的SetExpressCheckoutResponseType 。
6. 在setExpressCheckout(SetExpressCheckoutReq setExpressCheckoutReq)方法旁边，有一个方法，它也采用ICredential参数并具有以下签名： setExpressCheckout(SetExpressCheckoutReq setExpressCheckoutReq, ICredential credential)

7. 再次使用Eclipse我查找了实现ICredential接口的类，发现有一个名为SignatureCredential类，构造函数有3个参数：username，password，signature。 这对我来说似乎还有很长的路要走。

   所以，非常近似 – 代码片段现在应该如下所示：

    final SetExpressCheckoutRequestType ppRequest = ...; // here you create your request as in code snippet above final Properties serviceConfigurationProperties = ...; // bookmark #1 final PayPalAPIInterfaceServiceService service = new PayPalAPIInterfaceServiceService(serviceConfigurationProperties); final SetExpressCheckoutReq request = new SetExpressCheckoutReq(); request.setSetExpressCheckoutRequest(ppRequest); final ICredentials credentials = new SignatureCredentials(username, password, signature); final SetExpressCheckoutResponseType response = service.setExpressCheckout(request, credentials); 

Bookmark #1 ：应该通过服务配置传递Properties实例。 要找出应该指定的属性，应该谷歌为它并尝试坚持原始的PayPal文档而不是第三方博客:)如果在Javadocs中PayPalAPIInterfaceServiceService类，他/她发现有文件提到“sdk_config。属性”。 在谷歌搜索之后，我发现了该文件的几个例子： 示例＃1 ， 示例＃2

请注意，这不是完整的解决方案 – 它更像是我之前使用PayPal SOAP API的一系列提示。 这个API经常变化而不是简洁的文档，因此我真的建议下载带有源代码的Merchant API jar，并且每当出现问题时 – 查看代码 – 这通常会澄清很多。 还请坚持PayPal的原始文档：

1. PayPal SOAP API基础知识
2. GitHub上的PayPal Merchant SDK

此外，如果您没有使用Java的Web服务客户端的经验，我建议您尝试使用网络上的教程来实现一些简单的 – 这可能会澄清很多。

再次抱歉没有发布完整而简洁的代码片段 – 我从现在起2年没有使用过PayPal，那时我花了一周的工作时间来查找所有细节并设置并运行。 请发帖问题 – 我会在有空的时候尝试回答

希望这可以帮助…

编辑

关于response.getAck()返回FAILURE – 我过去也经历过这样的问题。 我通过试验请求中发送的参数解决了这个问题 – PayPal对这些参数非常敏感，如果省略任何参数或者没有正确的值，只需返回FAILURE 。

可以在这里找到完整的参数列表： PayPal SetExpressCheckout SOAP API文档

另请注意， Merchant SDK 2.5.106版本使用的是版本106.0 API。

希望这可以帮助…

Answer 2

您需要设置端点URL

  service.EndPoint=https://api-3t.paypal.com/2.0 

此外，您可能还需要更多设置：

  service.Binding=SOAP service.EndPoint=https://api-3t.paypal.com/2.0 service.RedirectURL=https://www.paypal.com/webscr&cmd= service.DevCentralURL=https://developer.paypal.com service.IPNEndpoint=https://www.paypal.com/cgi-bin/webscr 

如果您使用沙箱，请使用以下设置：

  service.Binding=SOAP service.EndPoint=https://api-3t.sandbox.paypal.com/2.0 service.RedirectURL=https://www.sandbox.paypal.com/webscr&cmd= service.DevCentralURL=https://developer.paypal.com service.IPNEndpoint=https://www.sandbox.paypal.com/cgi-bin/webscr