java.lang.ClassCastException: com.sun.net.ssl.internal.www.protocol.https.HttpsURLConnectionOldImpl 无法转换为 javax.net.ssl.HttpsURL
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java.lang.ClassCastException: com.sun.net.ssl.internal.www.protocol.https.HttpsURLConnectionOldImpl cannot be cast to javax.net.ssl.HttpsURLConnection
提问by libik
I tried this code in my Netbeans 7.4 and it works without problem
我在我的 Netbeans 7.4 中尝试了这段代码，它没有问题
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();
}
}
However then I used it in eclipse in my maven-driven project and it throws following exception :
但是后来我在我的 Maven 驱动的项目中的 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
This is following class in my maven project that throws an error
这是我的 Maven 项目中引发错误的课程
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
}
}
This is my pom.xml
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>
Any idea, why it does compile and run without problem on netbeans and why it does not go well on maven-eclipse project?
任何想法，为什么它在 netbeans 上编译和运行没有问题，为什么它在 maven-eclipse 项目上运行不顺利？
(I compile through command line using mvn package, I run it through eclipse)
（我通过命令行使用编译mvn package，我通过eclipse运行它）
采纳答案by libik
The solution is to change this line
解决方案是改变这一行
URL url = new URL("https://redmine.xxx.cz/time_entries.xml");
into this line
进入这条线
URL url = new URL(null, "https://redmine.xxx.cz/time_entries.xml", new sun.net.www.protocol.https.Handler());
回答by Realdo Dias
If you are using simply HTTPprotocol (not HTTPS), instead of:
如果您使用的是简单的HTTP协议（不是HTTPS），而不是：
HttpsURLConnection httpCon = (HttpsURLConnection) url.openConnection();
HttpsURLConnection httpCon = (HttpsURLConnection) url.openConnection();
Use this:
用这个：
HttpURLConnection httpCon = (HttpURLConnection) url.openConnection();
HttpURLConnection httpCon = (HttpURLConnection) url.openConnection();
Just drop the "s" in "HttpsURLConnection"
只需在“Http sURLConnection”中删除“ s”
回答by Sachin Panchal
It called if url starts with "https"
如果 url 以“https”开头，则调用它
if(url.startswith("https"){ HttpsURLConnection httpCon = (HttpsURLConnection) url.openConnection(); }
use netty-3.9.2 > .jar to solve this issue When you use this netty.jar. the process of post call changed.
使用netty-3.9.2 > .jar 解决这个问题当你使用这个netty.jar。post call的过程发生了变化。
http://dl.bintray.com/netty/downloads/netty-3.9.12.Final.tar.bz2
http://dl.bintray.com/netty/downloads/netty-3.9.12.Final.tar.bz2
回答by Nico
To avoid this kind of error you can use HttpUrlConnection (java.net.HttpUrlConnection) for both http and https url
为了避免这种错误，您可以对 http 和 https url 使用 HttpUrlConnection (java.net.HttpUrlConnection)
HttpsUrlConnection only add extra methods that "can be used" for https connection but you probably won't use these methods.
HttpsUrlConnection 只为 https 连接添加“可以使用”的额外方法，但您可能不会使用这些方法。
Both HttpsUrlConnection and HttpUrlConnection derived from UrlConnection which contains methods that permit to read the response like getInputStream(). HttpsUrlConnection derived from HttpUrlConnection which derived from UrlConnection.
HttpsUrlConnection 和 HttpUrlConnection 派生自 UrlConnection，其中包含允许读取响应的方法，如 getInputStream()。HttpsUrlConnection 派生自 HttpUrlConnection 派生自 UrlConnection。
java.net.HttpUrlConnection just add methods relative to http protocol (these methods apply to https)
java.net.HttpUrlConnection 只是添加了相对于 http 协议的方法（这些方法适用于 https）
https://docs.oracle.com/javase/8/docs/api/java/net/HttpURLConnection.htmlhttps://docs.oracle.com/javase/8/docs/api/javax/net/ssl/HttpsURLConnection.html
https://docs.oracle.com/javase/8/docs/api/java/net/HttpURLConnection.html https://docs.oracle.com/javase/8/docs/api/javax/net/ssl/HttpsURLConnection .html
Thus you can do this :
因此你可以这样做：
URL url = new URL(urlString);
HttpURLConnection con = (HttpURLConnection) url.openConnection();
con.setRequestMethod("GET");
BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
As well you can do this and obtain the same result, the connection will be the same :
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()));
