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我正在尝试运行 java 程序，但出现以下运行时错误。错误如下所示。

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/http/params/SyncBasicHttpParams
    at org.apache.http.impl.client.DefaultHttpClient.createHttpParams(DefaultHttpClient.java:157)
    at org.apache.http.impl.client.AbstractHttpClient.getParams(AbstractHttpClient.java:448)
    at org.apache.http.impl.client.AbstractHttpClient.createClientConnectionManager(AbstractHttpClient.java:309)
    at org.apache.http.impl.client.AbstractHttpClient.getConnectionManager(AbstractHttpClient.java:466)
    at org.apache.http.impl.client.AbstractHttpClient.createHttpContext(AbstractHttpClient.java:286)
    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:851)
    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:805)
    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:784)
    at net.floodlightcontroller.core.internal.PacketStreamerClient.registerForPackets(PacketStreamerClient.java:90)
    at net.floodlightcontroller.core.internal.PacketStreamerClient.main(PacketStreamerClient.java:51)
Caused by: java.lang.ClassNotFoundException: org.apache.http.params.SyncBasicHttpParams
    at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 10 more

错误是java.lang.NoClassDefFoundError

现在显而易见的原因NoClassDefFoundError是特定类在 Classpath 中不可用，因此我们需要将其添加到 Classpath 中，或者如果我们期望它在 Classpath 中不可用，我们需要检查它为什么不可用。

现在我添加到类路径中的文件如下。

export CLASSPATH=$(JARS=(./lib/*.jar); IFS=:; echo "${JARS[*]}")
export CLASSPATH=$CLASSPATH:~/.m2/repository/org/apache/httpcomponents/httpclient/4.0.1/httpclient-4.0.1.jar
export CLASSPATH=$CLASSPATH:~/.m2/repository/org/apache/httpcomponents/httpcore/4.0.1/httpcore-4.0.1.jar
export CLASSPATH=$CLASSPATH:~/.m2/repository/commons-logging/commons-logging/1.1.1/commons-logging-1.1.1.jar
export CLASSPAHT=$CLASSPATH:~/ms_thesis/ONOS/httpcore-4.1.jar
#export CLASSPATH=$CLASSPATH:~/ms_thesis/ONOS/lib/httpclient-4.2.jar
export CLASSPATH=$CLASSPATH:~/google-gson-2.2.4/gson-2.2.4.jar

我应该添加什么 jar 文件来查找“org/apache/http/params/SyncBasicHttpParams” 我对 java 很陌生，不知道如何调试这个问题。

4

4 回答 4

2

According to the official documentation, the class that you seek is only in httpcore since 4.1. You'll want to pull a new JAR.

于 2013-08-15T05:33:24.450 回答
1

org/apache/http/params/SyncBasicHttpParams class is under httpcore-4.1-alpha1.jar , which can be downloaded from

http://mirrors.ibiblio.org/pub/mirrors/maven2/org/apache/httpcomponents/httpcore/4.1-alpha1/httpcore-4.1-alpha1.jar

In future if you need to find a jar for a class, then you can use this link, this is generally helpful:

http://www.findjar.com/

于 2013-08-15T05:34:09.427 回答
0

在您的情况下，您似乎错过了一些需要包含在项目中的 jar 文件

否则，您的任何一个链接都会给出异常，主要是因为静态方法调用或初始化

于 2013-10-25T05:12:35.923 回答
0

这是获取jar文件httpcore-4.1的链接

于 2013-10-25T05:16:35.777 回答