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ReISV接入钉钉详细示例以及代码JAVA版本 访问      ttp://127.0.0.1:8080/ding-isv-access/checkpreload.htm 无法显示此网页，请问是什么原因？？

Re钉钉新建套件回调Url问题 解决了吗？我的也是这样 java.lang.NullPointerException     at com.alibaba.dingtalk.openapi.servlet.IsvReceiveServlet.doGet(IsvReceiveServlet.java:80)     at javax.servlet.http.HttpServlet.service(HttpServlet.java:620)     at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)     at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)     at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:503)     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)     at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)     at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:421)     at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1070)     at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611)     at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:314)     at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)     at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)     at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)     at java.lang.Thread.run(Unknown Source) com.alibaba.dingtalk.openapi.demo.utils.aes.DingTalkEncryptException: 签名计算失败     at com.alibaba.dingtalk.openapi.demo.utils.aes.DingTalkEncryptor.getSignature(DingTalkEncryptor.java:206)     at com.alibaba.dingtalk.openapi.demo.utils.aes.DingTalkEncryptor.getDecryptMsg(DingTalkEncryptor.java:89)     at com.alibaba.dingtalk.openapi.servlet.IsvReceiveServlet.doGet(IsvReceiveServlet.java:104)     at javax.servlet.http.HttpServlet.service(HttpServlet.java:620)     at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)     at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)     at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:503)     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)     at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)     at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:421)     at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1070)     at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611)     at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:314)     at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)     at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)     at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)     at java.lang.Thread.run(Unknown Source)