如何修复 azure-activedirectory-library-for-java 中的 ClassCastException？

how can I fix ClassCastException in azure-activedirectory-library-for-java?

我正在尝试构建 azure AD library for java，但在构建时出现此错误，知道为什么吗？

2218 [pool-1-thread-1] ERROR com.microsoft.aad.adal4j.AuthenticationContext - [Correlation ID: ac256c7c-b9ae-41ff-b39c-f0746a2275f7] Request to acquire token failed.
java.lang.ClassCastException: sun.net.www.protocol.https.HttpsURLConnectionImpl cannot be cast to javax.net.ssl.HttpsURLConnection
at com.microsoft.aad.adal4j.HttpHelper.openConnection(HttpHelper.java:102)
at com.microsoft.aad.adal4j.HttpHelper.openConnection(HttpHelper.java:115)
at com.microsoft.aad.adal4j.HttpHelper.executeHttpGet(HttpHelper.java:49)
at com.microsoft.aad.adal4j.AuthenticationAuthority.doDynamicInstanceDiscovery(AuthenticationAuthority.java:146)
at com.microsoft.aad.adal4j.AuthenticationAuthority.doInstanceDiscovery(AuthenticationAuthority.java:130)
at com.microsoft.aad.adal4j.AuthenticationContext.acquireTokenCommon(AuthenticationContext.java:813)
at com.microsoft.aad.adal4j.AuthenticationContext.access(AuthenticationContext.java:806)
at com.microsoft.aad.adal4j.AuthenticationContext.call(AuthenticationContext.java:175)
at com.microsoft.aad.adal4j.AuthenticationContext.call(AuthenticationContext.java:1)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Warning: Could not get charToByteConverterClass!
638 [main] INFO com.microsoft.aad.adal4j.WSTrustResponse - Found token of type: urn:oasis:names:tc:SAML:1.0:assertion

编辑：

java -版本输出为：

java version "1.8.0_91"
Java(TM) SE Runtime Environment (build 1.8.0_91-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.91-b14, mixed mode)

mvn -v 输出为：

Apache Maven 3.3.9 (bb52d8502b132ec0a5a3f4c09453c07478323dc5; 2015-11-10T18:41:47+02:00)
Maven home: /Users/vanddel/work/apache-maven-3.3.9
Java version: 1.8.0_91, vendor: Oracle Corporation
Java home: /Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "mac os x", version: "10.11.4", arch: "x86_64", family: "mac"

这是 mvn package 的输出，我编辑了 pom.xml 文件以添加 slf4j-simple 依赖项，它修复了输出中的 NOP 错误，但随后出现了 ClassCastException 错误。 

<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-simple</artifactId>
<version>1.6.4</version>
</dependency>




MacBook:azure-activedirectory-library-for-java vanddel$ mvn package
[INFO] Scanning for projects...
[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building adal4j 1.1.2
[INFO] ------------------------------------------------------------------------
[INFO] 
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ adal4j ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] skip non existing resourceDirectory /Users/vanddel/Documents/workspace/azure-activedirectory-library-for-java/src/main/resources
[INFO] 
[INFO] --- maven-compiler-plugin:3.0:compile (default-compile) @ adal4j ---
[INFO] Nothing to compile - all classes are up to date
[INFO] 
[INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ adal4j ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 5 resources
[INFO] 
[INFO] --- maven-compiler-plugin:3.0:testCompile (default-testCompile) @ adal4j ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 16 source files to /Users/vanddel/Documents/workspace/azure-activedirectory-library-for-java/target/test-classes
[INFO] 
[INFO] --- maven-surefire-plugin:2.10:test (default-test) @ adal4j ---
[INFO] Surefire report directory: /Users/vanddel/Documents/workspace/azure-activedirectory-library-for-java/target/surefire-reports

-------------------------------------------------------
 T E S T S
-------------------------------------------------------
Running TestSuite
SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
Warning: Could not get charToByteConverterClass!
Tests run: 65, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 8.032 sec

Results :

Tests run: 65, Failures: 0, Errors: 0, Skipped: 0

[INFO] 
[INFO] --- maven-jar-plugin:2.5:jar (default-jar) @ adal4j ---
[INFO] 
[INFO] --- maven-javadoc-plugin:2.9.1:jar (attach-javadocs) @ adal4j ---
[INFO] 
Loading source files for package com.microsoft.aad.adal4j...
Constructing Javadoc information...
Standard Doclet version 1.8.0_91
Building tree for all the packages and classes...
Generating /Users/vanddel/Documents/workspace/azure-activedirectory-library-for-java/target/apidocs/com/microsoft/aad/adal4j/AsymmetricKeyCredential.html...
Generating /Users/vanddel/Documents/workspace/azure-activedirectory-library-for-java/target/apidocs/com/microsoft/aad/adal4j/AuthenticationCallback.html...
Generating /Users/vanddel/Documents/workspace/azure-activedirectory-library-for-java/target/apidocs/com/microsoft/aad/adal4j/AuthenticationContext.html...
Generating /Users/vanddel/Documents/workspace/azure-activedirectory-library-for-java/target/apidocs/com/microsoft/aad/adal4j/AuthenticationException.html...
Generating /Users/vanddel/Documents/workspace/azure-activedirectory-library-for-java/target/apidocs/com/microsoft/aad/adal4j/AuthenticationResult.html...
Generating /Users/vanddel/Documents/workspace/azure-activedirectory-library-for-java/target/apidocs/com/microsoft/aad/adal4j/ClientAssertion.html...
Generating /Users/vanddel/Documents/workspace/azure-activedirectory-library-for-java/target/apidocs/com/microsoft/aad/adal4j/ClientCredential.html...
Generating /Users/vanddel/Documents/workspace/azure-activedirectory-library-for-java/target/apidocs/com/microsoft/aad/adal4j/NamespaceContextImpl.html...
Generating /Users/vanddel/Documents/workspace/azure-activedirectory-library-for-java/target/apidocs/com/microsoft/aad/adal4j/UserInfo.html...
Generating /Users/vanddel/Documents/workspace/azure-activedirectory-library-for-java/target/apidocs/com/microsoft/aad/adal4j/package-frame.html...
Generating /Users/vanddel/Documents/workspace/azure-activedirectory-library-for-java/target/apidocs/com/microsoft/aad/adal4j/package-summary.html...
Generating /Users/vanddel/Documents/workspace/azure-activedirectory-library-for-java/target/apidocs/com/microsoft/aad/adal4j/package-tree.html...
Generating /Users/vanddel/Documents/workspace/azure-activedirectory-library-for-java/target/apidocs/constant-values.html...
Generating /Users/vanddel/Documents/workspace/azure-activedirectory-library-for-java/target/apidocs/serialized-form.html...
Generating /Users/vanddel/Documents/workspace/azure-activedirectory-library-for-java/target/apidocs/com/microsoft/aad/adal4j/class-use/UserInfo.html...
Generating /Users/vanddel/Documents/workspace/azure-activedirectory-library-for-java/target/apidocs/com/microsoft/aad/adal4j/class-use/NamespaceContextImpl.html...
Generating /Users/vanddel/Documents/workspace/azure-activedirectory-library-for-java/target/apidocs/com/microsoft/aad/adal4j/class-use/ClientCredential.html...
Generating /Users/vanddel/Documents/workspace/azure-activedirectory-library-for-java/target/apidocs/com/microsoft/aad/adal4j/class-use/ClientAssertion.html...
Generating /Users/vanddel/Documents/workspace/azure-activedirectory-library-for-java/target/apidocs/com/microsoft/aad/adal4j/class-use/AuthenticationResult.html...
Generating /Users/vanddel/Documents/workspace/azure-activedirectory-library-for-java/target/apidocs/com/microsoft/aad/adal4j/class-use/AuthenticationException.html...
Generating /Users/vanddel/Documents/workspace/azure-activedirectory-library-for-java/target/apidocs/com/microsoft/aad/adal4j/class-use/AuthenticationContext.html...
Generating /Users/vanddel/Documents/workspace/azure-activedirectory-library-for-java/target/apidocs/com/microsoft/aad/adal4j/class-use/AuthenticationCallback.html...
Generating /Users/vanddel/Documents/workspace/azure-activedirectory-library-for-java/target/apidocs/com/microsoft/aad/adal4j/class-use/AsymmetricKeyCredential.html...
Generating /Users/vanddel/Documents/workspace/azure-activedirectory-library-for-java/target/apidocs/com/microsoft/aad/adal4j/package-use.html...
Building index for all the packages and classes...
Generating /Users/vanddel/Documents/workspace/azure-activedirectory-library-for-java/target/apidocs/overview-tree.html...
Generating /Users/vanddel/Documents/workspace/azure-activedirectory-library-for-java/target/apidocs/index-all.html...
Generating /Users/vanddel/Documents/workspace/azure-activedirectory-library-for-java/target/apidocs/deprecated-list.html...
Building index for all classes...
Generating /Users/vanddel/Documents/workspace/azure-activedirectory-library-for-java/target/apidocs/allclasses-frame.html...
Generating /Users/vanddel/Documents/workspace/azure-activedirectory-library-for-java/target/apidocs/allclasses-noframe.html...
Generating /Users/vanddel/Documents/workspace/azure-activedirectory-library-for-java/target/apidocs/index.html...
Generating /Users/vanddel/Documents/workspace/azure-activedirectory-library-for-java/target/apidocs/help-doc.html...
14 warnings
[WARNING] Javadoc Warnings
[WARNING] /Users/vanddel/Documents/workspace/azure-activedirectory-library-for-java/src/main/java/com/microsoft/aad/adal4j/AsymmetricKeyCredential.java:95: warning: no description for @throws
[WARNING] * @throws CertificateEncodingException
[WARNING] ^
[WARNING] /Users/vanddel/Documents/workspace/azure-activedirectory-library-for-java/src/main/java/com/microsoft/aad/adal4j/AsymmetricKeyCredential.java:96: warning: no description for @throws
[WARNING] * @throws NoSuchAlgorithmException
[WARNING] ^
[WARNING] /Users/vanddel/Documents/workspace/azure-activedirectory-library-for-java/src/main/java/com/microsoft/aad/adal4j/AsymmetricKeyCredential.java:108: warning: no description for @throws
[WARNING] * @throws CertificateEncodingException
[WARNING] ^
[WARNING] /Users/vanddel/Documents/workspace/azure-activedirectory-library-for-java/src/main/java/com/microsoft/aad/adal4j/AsymmetricKeyCredential.java:109: warning: no description for @throws
[WARNING] * @throws NoSuchAlgorithmException
[WARNING] ^
[WARNING] /Users/vanddel/Documents/workspace/azure-activedirectory-library-for-java/src/main/java/com/microsoft/aad/adal4j/AsymmetricKeyCredential.java:136: warning: no description for @throws
[WARNING] * @throws KeyStoreException
[WARNING] ^
[WARNING] /Users/vanddel/Documents/workspace/azure-activedirectory-library-for-java/src/main/java/com/microsoft/aad/adal4j/AsymmetricKeyCredential.java:137: warning: no description for @throws
[WARNING] * @throws NoSuchProviderException
[WARNING] ^
[WARNING] /Users/vanddel/Documents/workspace/azure-activedirectory-library-for-java/src/main/java/com/microsoft/aad/adal4j/AsymmetricKeyCredential.java:138: warning: no description for @throws
[WARNING] * @throws NoSuchAlgorithmException
[WARNING] ^
[WARNING] /Users/vanddel/Documents/workspace/azure-activedirectory-library-for-java/src/main/java/com/microsoft/aad/adal4j/AsymmetricKeyCredential.java:139: warning: no description for @throws
[WARNING] * @throws CertificateException
[WARNING] ^
[WARNING] /Users/vanddel/Documents/workspace/azure-activedirectory-library-for-java/src/main/java/com/microsoft/aad/adal4j/AsymmetricKeyCredential.java:140: warning: no description for @throws
[WARNING] * @throws FileNotFoundException
[WARNING] ^
[WARNING] /Users/vanddel/Documents/workspace/azure-activedirectory-library-for-java/src/main/java/com/microsoft/aad/adal4j/AsymmetricKeyCredential.java:141: warning: no description for @throws
[WARNING] * @throws IOException
[WARNING] ^
[WARNING] /Users/vanddel/Documents/workspace/azure-activedirectory-library-for-java/src/main/java/com/microsoft/aad/adal4j/AsymmetricKeyCredential.java:142: warning: no description for @throws
[WARNING] * @throws UnrecoverableKeyException
[WARNING] ^
[WARNING] /Users/vanddel/Documents/workspace/azure-activedirectory-library-for-java/src/main/java/com/microsoft/aad/adal4j/AuthenticationContext.java:145: warning: no description for @param
[WARNING] * @param sslSocketFactory
[WARNING] ^
[WARNING] /Users/vanddel/Documents/workspace/azure-activedirectory-library-for-java/src/main/java/com/microsoft/aad/adal4j/AuthenticationContext.java:310: warning: no description for @throws
[WARNING] * @throws AuthenticationException
[WARNING] ^
[WARNING] /Users/vanddel/Documents/workspace/azure-activedirectory-library-for-java/src/main/java/com/microsoft/aad/adal4j/AuthenticationContext.java:376: warning: no description for @throws
[WARNING] * @throws AuthenticationException
[WARNING] ^
[INFO] Building jar: /Users/vanddel/Documents/workspace/azure-activedirectory-library-for-java/target/adal4j-1.1.2-javadoc.jar
[INFO] 
[INFO] >>> maven-source-plugin:2.2.1:jar (attach-sources) > generate-sources @ adal4j >>>
[INFO] 
[INFO] <<< maven-source-plugin:2.2.1:jar (attach-sources) < generate-sources @ adal4j <<<
[INFO] 
[INFO] --- maven-source-plugin:2.2.1:jar (attach-sources) @ adal4j ---
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 27.151 s
[INFO] Finished at: 2016-05-16T16:39:49+02:00
[INFO] Final Memory: 25M/185M
[INFO] ------------------------------------------------------------------------

当使用生成到 运行 public-client-adal4j-sample 的 jar 时，我收到此错误：

com.microsoft.aad.adal4j.AuthenticationException: {"error_description":"AADSTS50034: To sign into this application the account must be added to the windows.net directory.\r\nTrace ID: 408f33c8-0716-476f-916c-7b5fbdca40c2\r\nCorrelation ID: ef2af04b-23a2-4f14-b001-d952374d11f8\r\nTimestamp: 2016-05-17 09:46:10Z","error":"invalid_grant"}
    at com.microsoft.aad.adal4j.AdalTokenRequest.executeOAuthRequestAndProcessResponse(AdalTokenRequest.java:108)
    at com.microsoft.aad.adal4j.AuthenticationContext.acquireTokenCommon(AuthenticationContext.java:819)
    at com.microsoft.aad.adal4j.AuthenticationContext.access0(AuthenticationContext.java:66)
    at com.microsoft.aad.adal4j.AuthenticationContext.call(AuthenticationContext.java:174)
    at com.microsoft.aad.adal4j.AuthenticationContext.call(AuthenticationContext.java:163)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)

快速的互联网搜索确实让人认为 sun.net.www.protocol.https.HttpsURLConnectionImpl 可以转换为 javax.net.ssl.HttpsURLConnection。所以这看起来像是一个 class 加载器问题。 您是否了解更多有关正在使用的 class 加载器（及其关系）的信息？

详细说明（如操作员在评论中所问）：

jvm 中的每个 class 都由三元组 "class name"、"package name" 及其 class 加载程序（更准确地说是 class 加载程序用于加载 class)。每个 class 加载器都是 class 加载器层次结构的一部分（特殊引导 class 加载器是根）。 ClassLoader 能够加载 classes（即 return class 对象，模拟有问题的 class 本身或从祖先加载，但不能通过 class 装载机是兄弟姐妹或后代。

因此，如果你有两个 classes C_1 和 C_2 具有相同的名称和相同的包名称，但从 class 加载器兄弟加载 ---没有上升到层次结构 --- classes 不被认为是相同的。因此，C_2 类型的对象 O_2 不能分配给 C_1 类型的变量；你得到一个 ClassCastException。

当将对象（作为 class 的实例）分配给接口类型的变量时，接口和假定实现此接口的 classes 也是如此。如果 class 和接口已经被不同的 class 加载程序加载，则分配可能会失败。

这就是为什么您应该查看您在设置中使用的 class 加载器以及哪个加载器加载界面以及哪个 class 的原因。您可以通过调用 HttpsURLConnectionImpl.class.getClassLoader().toString() 和 HttpsURLConnection.class.getClassLoader().toString().

来质疑两者

我尝试重现该问题，但失败了。我从 GitHub 克隆了 adal4j 存储库，并通过命令 mvn package 成功打包它。

这是我的环境中的步骤。

OS: Ubuntu 14.04 LTS
Java SDK: JDK 1.8.0u51 64bit
Maven: 3.3.9
  1. 在 ~/.profile 文件中为 JDK 和 Maven 设置环境。
export JAVA_HOME=~/<my-sdk-path>/jdk1.8.0_51
export CLASSPATH=.:$JAVA_HOME/lib
export PATH=$JAVA_HOME/bin:$PATH

export M2_HOME=~/<my-sdk-path>/apache-maven-3.3.9
export PATH=$PATH:$M2_HOME/bin
  1. 检查 JDK & Maven
~ $ java -version
~ $ mvn -v
  1. 克隆项目的当前存储库adal4j。
~ $ git clone https://github.com/AzureAD/azure-activedirectory-library-for-java.git
  1. 打包 adal4j 项目。
~ $ cd azure-activedirectory-library-for-java
~ $ mvn package

我尝试通过导入现有的 Maven 项目选项打包它并在 Eclipse 中导出 jar 文件，它也成功。

所以我认为这个问题可能是由环境变量中的噪音引起的，比如 PATH 无论你使用什么 Windows 或其他。请尝试清理您的环境或使用Eclipse等IDE进行编译。

希望对您有所帮助。如有任何疑问，请随时告诉我。