JAVA_Error: Error for /wechat.do

java.lang.NoSuchFieldError: INSTANCE

at org.apache.http.impl.io.DefaultHttpRequestWriterFactory.<init>(DefaultHttpRequestWriterFactory.java:52)

at org.apache.http.impl.io.DefaultHttpRequestWriterFactory.<init>(DefaultHttpRequestWriterFactory.java:56)

at org.apache.http.impl.io.DefaultHttpRequestWriterFactory.<clinit>(DefaultHttpRequestWriterFactory.java:46)

at org.apache.http.impl.conn.ManagedHttpClientConnectionFactory.<init>(ManagedHttpClientConnectionFactory.java:72)

at org.apache.http.impl.conn.ManagedHttpClientConnectionFactory.<init>(ManagedHttpClientConnectionFactory.java:84)

at org.apache.http.impl.conn.ManagedHttpClientConnectionFactory.<clinit>(ManagedHttpClientConnectionFactory.java:59)

at org.apache.http.impl.conn.PoolingHttpClientConnectionManager$InternalConnectionFactory.<init>(PoolingHttpClientConnectionManager.java:493)

at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.<init>(PoolingHttpClientConnectionManager.java:149)

at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.<init>(PoolingHttpClientConnectionManager.java:138)

at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.<init>(PoolingHttpClientConnectionManager.java:114)

at org.apache.http.impl.client.HttpClientBuilder.build(HttpClientBuilder.java:726)

at org.apache.http.impl.client.HttpClients.createDefault(HttpClients.java:58)

at demo.process.TulingApiProcess.getTulingResult(TulingApiProcess.java:39)

at demo.process.WechatProcess.processWechatMag(WechatProcess.java:23)

at demo.servlet.WechatServlet.doPost(WechatServlet.java:87)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)

at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:538)

at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:478) yq32.javaruntime 

百度没有百度到 FQ去google说是可能是httpclient包冲突的问题 可是war包中仅仅有一个，没有办法去了新浪云计算平台开发论坛。

最后知道真相的我眼泪掉下来原来新浪sae临时仅仅支持httpclient4.1.x。

然后换成http4.1.x结果成功了。另附新浪sae的说明文档提供的

地址下载完整的jar包依赖包链接：

总结：以后使用一些第三方平台一定要事先阅读其说明文档。避免像无头苍蝇一样胡乱百度。