TrustStrategy——Java中httpclient.jar和httpcore.jar版本差异带来的异常

来源：http://blog.csdn.net/loongshawn/article/details/50590660

前言说明：当前我的工程中使用的httpclient-4.3.6.jar和httpcore-4.3.3.jar版本的包。

    org.apache.httpcomponents
    httpcore
    4.3.3


    org.apache.httpcomponents
    httpclient
    4.3.6
   
1
2
3
4
5
6
7
8
9
10
1
2
3
4
5
6
7
8
9
10

今天执行阿里云的OSS相关操作时，首先提示以下异常:

java.lang.ClassNotFoundException: org.apache.http.ssl.TrustStrategy
1
1

详细如下：

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/http/ssl/TrustStrategy
    at com.aliyun.oss.OSSClient.(OSSClient.java:246)
    at com.aliyun.oss.OSSClient.(OSSClient.java:206)
    at com.autonavi.oss.client.DefaultOSSClient.(DefaultOSSClient.java:12)
    at com.autonavi.oss.put.Upload.put(Upload.java:20)
    at com.autonavi.oss.put.Upload.main(Upload.java:58)
Caused by: java.lang.ClassNotFoundException: org.apache.http.ssl.TrustStrategy
    at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
    ... 5 more
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16

从上面报错提示可以看出，是org/apache/http/ssl/TrustStrategy下面找不到TrustStrategy这个类，我查了下依赖中的httpclient-4.3.6.jar和httpcore-4.3.3.jar两个包，均没有这个类。 

而4.4版本中有ssl路径： 
 
及对应org/apache/http/ssl/TrustStrategy方法。 
 
很明显是版本不对，应该换成新版本。

    org.apache.httpcomponents
    httpcore
    4.4
 
1
2
3
4
5
1
2
3
4
5

重新执行代码，上面异常已经消失，不过出现新异常：

java.lang.NoClassDefFoundError: org/apache/http/conn/ssl/NoopHostnameVerifier
1
1

异常详细：

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/http/conn/ssl/NoopHostnameVerifier
    at com.aliyun.oss.common.comm.DefaultServiceClient.createHttpClientConnectionManager(DefaultServiceClient.java:230)
    at com.aliyun.oss.common.comm.DefaultServiceClient.(DefaultServiceClient.java:78)
    at com.aliyun.oss.OSSClient.(OSSClient.java:246)
    at com.aliyun.oss.OSSClient.(OSSClient.java:206)
    at com.autonavi.oss.client.DefaultOSSClient.(DefaultOSSClient.java:12)
    at com.autonavi.oss.put.Upload.put(Upload.java:20)
    at com.autonavi.oss.put.Upload.main(Upload.java:58)
Caused by: java.lang.ClassNotFoundException: org.apache.http.conn.ssl.NoopHostnameVerifier
    at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
    ... 7 more
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17

很明显是版本不对，是由于httpclient-4.3.6.jar缺少NoopHostnameVerifier方法： 

而4.4版本中有这个方法： 
 
应该换成新版本，即换成httpclient-4.4.jar

    org.apache.httpcomponents
    httpclient
    4.4
   
1
2
3
4
5
1
2
3
4
5

查看下jar包中相应路径存在上面那个类。

最后再次执行，执行成功，无异常！

所以，下次碰到以下两个异常时： 
1、

java.lang.ClassNotFoundException: org.apache.http.ssl.TrustStrategy
1
1

2、

java.lang.NoClassDefFoundError: org/apache/http/conn/ssl/NoopHostnameVerifier
1
1

需要升级httpclient.jar和httpcore.jar两个包的版本，4.3的版本中不含有上述两个类，需要同时升级到4.4版本。

即替换为httpclient-4.4.jar和httpcore-4.4.jar