java.lang.ClassCastException:com.sun.net.ssl.internal.www.protocol.https.HttpsURLConnectionOldImpl不能强制转换为javax.net.ssl.HttpsURLConnection
我在我的Netbeans 7.4中尝试了这段代码,它可以正常工作java.lang.ClassCastException:com.sun.net.ssl.internal.www.protocol.https.HttpsURLConnectionOldImpl不能强制转换为javax.net.ssl.HttpsURLConnection,java,eclipse,maven,netbeans,classnotfoundexception,Java,Eclipse,Maven,Netbeans,Classnotfoundexception,我在我的Netbeans 7.4中尝试了这段代码,它可以正常工作 import java.io.IOException; import java.net.URL; import javax.net.ssl.HttpsURLConnection; public class JavaApplication148 { public static void main(String[] args) throws IOException { URL url = new URL("h
import java.io.IOException;
import java.net.URL;
import javax.net.ssl.HttpsURLConnection;
public class JavaApplication148 {
public static void main(String[] args) throws IOException {
URL url = new URL("https://redmine.ackee.cz/time_entries.xml");
HttpsURLConnection httpCon = (HttpsURLConnection) url.openConnection();
}
}
然而,我在我的maven驱动项目的eclipse中使用了它,它引发了以下异常:
java.lang.ClassCastException: com.sun.net.ssl.internal.www.protocol.https.HttpsURLConnectionOldImpl
cannot be cast to javax.net.ssl.HttpsURLConnection
下面是我的maven项目中抛出错误的类
package cz.ackee.redmine.commands;
import java.io.IOException;
import java.net.URL;
import javax.net.ssl.HttpsURLConnection;
public abstract class RedmineCommand {
public void write(String xmlAddress, String text, String requestMethod) throws IOException{
URL url = new URL("https://redmine.xxx.cz/time_entries.xml");
HttpsURLConnection httpCon = (HttpsURLConnection) url.openConnection(); //this line throws exception
}
}
这是我的pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>cz.ackee</groupId>
<artifactId>pan-unicorn-bot</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>Pan Unicorn Bot</name>
<description>Pan unicorn IRC Bot</description>
<repositories>
<repository>
<id>apache-snapshots</id>
<url>http://repository.apache.org/snapshots/</url>
</repository>
</repositories>
<dependencies>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.30</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>4.3.5.Final</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-cli</artifactId>
<version>1.3-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>com.taskadapter</groupId>
<artifactId>redmine-java-api</artifactId>
<version>1.23</version>
</dependency>
</dependencies>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
</properties>
<build>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<groupId>org.apache.maven.plugins</groupId>
<version>2.3</version>
<configuration>
<source>1.7</source>
<target>1.7</target>
<downloadSources>true</downloadSources>
<downloadJavadocs>true</downloadJavadocs>
</configuration>
</plugin>
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<version>2.2.1</version>
<configuration>
<descriptors>
<descriptor>/src/main/assembly/binary.xml</descriptor>
</descriptors>
</configuration>
<executions>
<execution>
<id>make-assembly</id>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>2.3.2</version>
<configuration>
<archive>
<index>true</index>
<manifest>
<addClasspath>true</addClasspath>
<mainClass>cz.ackee.unicorn.PanUnicornMain</mainClass>
</manifest>
<manifestEntries>
<mode>development</mode>
<url>${project.url}</url>
<key>value</key>
</manifestEntries>
</archive>
</configuration>
</plugin>
</plugins>
</build>
</project>
4.0.0
cz.ackee
泛独角兽机器人
0.0.1-快照
泛独角兽机器人
泛独角兽IRC机器人
apache快照
http://repository.apache.org/snapshots/
mysql
mysql连接器java
5.1.30
org.hibernate
冬眠核心
4.3.5.最终版本
org.apache.commons
commons cli
1.3-1
com.taskadapter
RedmineJavaAPI
1.23
UTF-8
UTF-8
maven编译器插件
org.apache.maven.plugins
2.3
1.7
1.7
真的
真的
maven汇编插件
2.2.1
/src/main/assembly/binary.xml
组装
包裹
单一的
org.apache.maven.plugins
maven jar插件
2.3.2
真的
真的
cz.ackee.unicorn.PanUnicornMain
发展
${project.url}
价值
你知道为什么它在netbeans上编译和运行没有问题,为什么它在maven eclipse项目上运行不好吗
(我使用mvn包通过命令行编译,我通过eclipse运行它)解决方案是更改这一行
URL url = new URL("https://redmine.xxx.cz/time_entries.xml");
进入这一行
URL url = new URL(null, "https://redmine.xxx.cz/time_entries.xml", new sun.net.www.protocol.https.Handler());
如果您只是使用
HTTP
协议(而不是HTTPS
),而不是:
HttpsURLConnection httpCon=(HttpsURLConnection)
openConnection()
使用以下命令:
HttpURLConnection httpCon=(HttpURLConnection)url.openConnection()
只要在“HttpsURLConnection”中删除“s”,如果url以“https”开头,它就会调用 使用netty-3.9.2>.jar解决此问题 当您使用这个netty.jar时。电话回访的过程发生了变化
为了避免此类错误,您可以对http和https url使用HttpUrlConnection(java.net.HttpUrlConnection) HttpsUrlConnection仅添加“可用于”https连接的额外方法,但您可能不会使用这些方法 HttpsUrlConnection和HttpUrlConnection都是从UrlConnection派生的,UrlConnection包含允许读取响应的方法,如getInputStream()。HttpsUrlConnection派生自HttpUrlConnection,HttpUrlConnection派生自UrlConnection java.net.HttpUrlConnection只需添加与http协议相关的方法(这些方法适用于https) 因此,您可以这样做:
URL url = new URL(urlString);
HttpURLConnection con = (HttpURLConnection) url.openConnection();
con.setRequestMethod("GET");
BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
您也可以这样做并获得相同的结果,连接将是相同的:
URL url = new URL(urlString);
HttpsURLConnection con = (HttpsURLConnection) url.openConnection();
con.setRequestMethod("GET");
BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
我猜你的classpath有点不同。classpath到底是什么?我在最新的luna eclipse中遇到了同样的异常。您的解决方案对我有效。请不要使用此解决方案。这是一种使用特定处理程序实现的变通方法。这可能会阻止代码在不同的JRE/JDK(供应商和/或版本)上运行。更多信息:虽然这个链接可以回答这个问题,但最好在这里包含答案的基本部分,并提供链接供参考。只有链接的答案可能会变得无效,如果链接页面更改,因为这是我正在寻找的。但这仅在协议为http
http
时有效,例如:http://www.mywebsite.com
(注意http
),而不是在安全协议https
(如OP案例)中。正如我在回答中所解释的,HttpURLConnection对https url也是有效的
URL url = new URL(urlString);
HttpsURLConnection con = (HttpsURLConnection) url.openConnection();
con.setRequestMethod("GET");
BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));