问题描述：
开发微信公众平台，本地tomcat可以正常获取token并发送模板消息，部署在weblogic后报错，异常信息如下：
java.security.InvalidKeyException: Illegal key size
解决办法：
在weblogic启动脚本中添加-DUseSunHttpHandler=true ，告诉WebLogic使用Sun的HttpHandler而不要使用WebLogic自己的。
参考资料：http://blog.csdn.net/arvinrong/article/details/7715334
详细异常信息：
java.security.InvalidKeyException: Illegal key size
at javax.crypto.Cipher.a(DashoA13*..)
at javax.crypto.Cipher.init(DashoA13*..)
at javax.crypto.Cipher.init(DashoA13*..)
at com.certicom.tls.provider.Cipher.init(Unknown Source)
at com.certicom.tls.ciphersuite.SecurityParameters.createWriteCipher(Unknown Source)
at com.certicom.tls.record.handshake.HandshakeHandler.changeCipherSpec(Unknown Source)
at com.certicom.tls.record.handshake.ClientStateReceivedCertificate.handle(Unknown Source)
at com.certicom.tls.record.handshake.HandshakeHandler.handleHandshakeMessage(Unknown Source)
at com.certicom.tls.record.handshake.HandshakeHandler.handleHandshakeMessages(Unknown Source)
at com.certicom.tls.record.MessageInterpreter.interpretContent(Unknown Source)
at com.certicom.tls.record.MessageInterpreter.decryptMessage(Unknown Source)
at com.certicom.tls.record.ReadHandler.processRecord(Unknown Source)
at com.certicom.tls.record.ReadHandler.readRecord(Unknown Source)
at com.certicom.tls.record.ReadHandler.readUntilHandshakeComplete(Unknown Source)
at com.certicom.tls.interfaceimpl.TLSConnectionImpl.completeHandshake(Unknown Source)
at com.certicom.tls.record.WriteHandler.write(Unknown Source)
at com.certicom.io.OutputSSLIOStreamWrapper.write(Unknown Source)
at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:65)
at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:123)
at java.io.FilterOutputStream.flush(FilterOutputStream.java:123)
at weblogic.net.http.HttpURLConnection.writeRequests(HttpURLConnection.java:186)
at weblogic.net.http.HttpURLConnection.getInputStream(HttpURLConnection.java:400)
at weblogic.net.http.SOAPHttpsURLConnection.getInputStream(SOAPHttpsURLConnection.java:37)
at com.payroll.wx.util.HttpsGetUtil.doHttpsGetJson(HttpsGetUtil.java:26)
at com.payroll.wx.util.AccessTokenUtil.getAT(AccessTokenUtil.java:43)
at com.payroll.wx.util.AccessTokenUtil.run(AccessTokenUtil.java:33)
at java.util.TimerThread.mainLoop(Timer.java:512)
at java.util.TimerThread.run(Timer.java:462)