Apache httpclient 4.3.1出现java.lang.NoSuchFieldError: INSTANCE错误

Question

我是在开发一个Java EE Web应用程序。

这是我的pom.xml文件：

<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/maven-v4_0_0.xsd">

<modelVersion>4.0.0</modelVersion>
<groupId>bitcoin</groupId>
<artifactId>bitcoin</artifactId>
<packaging>war</packaging>
<version>1.0-SNAPSHOT</version>
<name>Chens Bitcoin Webapp</name>
<url>http://maven.apache.org</url>

<properties>
    <endorsed.dir>${project.build.directory}/endorsed</endorsed.dir>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <!-- Define the version of the JBoss BOMs we want to import to specify tested stacks. -->
    <version.jboss.bom>1.0.5.CR6</version.jboss.bom>
</properties>

<repositories>
    <repository>
        <id>prime-repo</id>
        <name>Prime Repo</name>
        <url>http://repository.primefaces.org</url>
    </repository>
</repositories>

<dependencyManagement>
    <dependencies>
        <!-- Define the version of JBoss' Java EE 6 APIs we want to use -->
        <!-- JBoss distributes a complete set of Java EE 6 APIs including
            a Bill of Materials (BOM). A BOM specifies the versions of a "stack" (or
            a collection) of artifacts. We use this here so that we always get the correct
            versions of artifacts. Here we use the jboss-javaee-6.0-with-security stack
            (you can read this as the JBoss stack of the Java EE 6 APIs with Security).
            You can actually use this stack with any version of JBoss AS that implements
            Java EE 6, not just JBoss AS 7! -->
        <dependency>
            <groupId>org.jboss.bom</groupId>
            <artifactId>jboss-javaee-6.0-with-security</artifactId>
            <version>${version.jboss.bom}</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
    </dependencies>
</dependencyManagement>

  <dependency>
      <groupId>javax</groupId>
      <artifactId>javaee-web-api</artifactId>
      <version>7.0</version>
      <scope>provided</scope>
  </dependency>

  <!--<dependency>-->
      <!--<groupId>org.jboss.spec.javax.faces</groupId>-->
      <!--<artifactId>jboss-jsf-api_2.2_spec</artifactId>-->
      <!--<version>2.2.0</version>-->
  <!--</dependency>-->

  <!--<dependency>-->
      <!--<groupId>com.sun.faces</groupId>-->
      <!--<artifactId>jsf-spi</artifactId>-->
      <!--<version>1.0</version>-->
  <!--</dependency>-->

  <!-- Rewrite -->
  <dependency>
      <groupId>org.ocpsoft.rewrite</groupId>
      <artifactId>rewrite-servlet</artifactId>
      <version>2.0.8.Final</version>
  </dependency>

  <dependency>
      <groupId>org.ocpsoft.rewrite</groupId>
      <artifactId>rewrite-config-prettyfaces</artifactId>
      <version>2.0.8.Final</version>
  </dependency>

  <dependency>
      <groupId>org.omnifaces</groupId>
      <artifactId>omnifaces</artifactId>
      <version>1.6</version>
  </dependency>

  <dependency>
      <groupId>commons-fileupload</groupId>
      <artifactId>commons-fileupload</artifactId>
      <version>1.3</version>
  </dependency>

  <dependency>
      <groupId>org.primefaces</groupId>
      <artifactId>primefaces</artifactId>
      <version>3.5</version>
  </dependency>

  <!-- Data time management -->
  <dependency>
      <groupId>joda-time</groupId>
      <artifactId>joda-time</artifactId>
      <version>2.2</version>
  </dependency>

  <dependency>
      <groupId>commons-codec</groupId>
      <artifactId>commons-codec</artifactId>
      <version>1.9</version>
  </dependency>

  <dependency>
      <groupId>org.apache.httpcomponents</groupId>
      <artifactId>httpclient</artifactId>
      <version>4.3.1</version>
  </dependency>

  <dependency>
      <groupId>com.googlecode.json-simple</groupId>
      <artifactId>json-simple</artifactId>
      <version>1.1.1</version>
  </dependency>

  <!-- Import the PicketLink API, we deploy this as library with the application,
        and can compile against it -->
  <dependency>
      <groupId>org.picketlink</groupId>
      <artifactId>picketlink-core-api</artifactId>
  </dependency>

  <!-- Import the PicketLink implementation, we deploy this as library with the application,
      but can't compile against it -->
  <dependency>
      <groupId>org.picketlink</groupId>
      <artifactId>picketlink-core-impl</artifactId>
      <scope>runtime</scope>
  </dependency>

<dependency>
  <groupId>junit</groupId>
  <artifactId>junit</artifactId>
  <version>3.8.1</version>
  <scope>test</scope>
  </dependency>
  </dependencies>
  <build>
  <finalName>bitcoin</finalName>
  <plugins>
      <plugin>
          <groupId>org.apache.maven.plugins</groupId>
          <artifactId>maven-compiler-plugin</artifactId>
          <version>3.1</version>
          <configuration>
              <source>1.7</source>
              <target>1.7</target>
              <compilerArguments>
                  <endorseddirs>${endorsed.dir}</endorseddirs>
              </compilerArguments>
          </configuration>
      </plugin>
      <plugin>
          <groupId>org.apache.maven.plugins</groupId>
          <artifactId>maven-war-plugin</artifactId>
          <version>2.3</version>
          <configuration>
              <failOnMissingWebXml>false</failOnMissingWebXml>
          </configuration>
      </plugin>
      <plugin>
          <groupId>org.jboss.as.plugins</groupId>
          <artifactId>jboss-as-maven-plugin</artifactId>
          <version>7.4.Final</version>
      </plugin>
      <plugin>
          <groupId>org.apache.maven.plugins</groupId>
          <artifactId>maven-dependency-plugin</artifactId>
          <version>2.6</version>
          <executions>
              <execution>
                  <phase>validate</phase>
                  <goals>
                      <goal>copy</goal>
                  </goals>
                  <configuration>
                      <outputDirectory>${endorsed.dir}</outputDirectory>
                      <silent>true</silent>
                      <artifactItems>
                          <artifactItem>
                              <groupId>javax</groupId>
                              <artifactId>javaee-endorsed-api</artifactId>
                              <version>7.0</version>
                              <type>jar</type>
                          </artifactItem>
                      </artifactItems>
                  </configuration>
              </execution>
          </executions>
      </plugin>
  </plugins>
</build>
</project>

我有一个创建HttpClient的方法，它单独使用时很好用，但在从jsf页面调用时遇到了问题：

  public void doSth() {
  ......
  HttpClient httpclient = HttpClientBuilder.create().build();
  ......
  }

当JSF页面上的CommonButton被点击时，会调用此方法。但是，出现了以下错误：

      Caused by: java.lang.NoSuchFieldError: INSTANCE
    at org.apache.http.impl.io.DefaultHttpRequestWriterFactory.<init>(DefaultHttpRequestWriterFactory.java:52) [httpcore-4.3.jar:4.3]
    at org.apache.http.impl.io.DefaultHttpRequestWriterFactory.<init>(DefaultHttpRequestWriterFactory.java:56) [httpcore-4.3.jar:4.3]
    at org.apache.http.impl.io.DefaultHttpRequestWriterFactory.<clinit>(DefaultHttpRequestWriterFactory.java:46) [httpcore-4.3.jar:4.3]
      ......

我找到了一些资料，似乎httpclient的jar文件与其他某些类存在冲突，但我真的弄不清楚是哪一个，而且pom中的所有依赖项都是必需的。

顺便说一下，我正在使用WildFly 8 CR作为服务器。

提前感谢。

- lastcow

---

这很像你的类路径中有两个不同版本的httpclient。你检查过WildFly是否带有httpclient吗？除此之外，可能是你的某个依赖项拉取了它自己的httpclient。尝试运行"mvn dependency:tree"并检查是否有两个版本的httpclient。 - Marcel Steinbach

另外，可能与此无关，您在依赖管理中使用“jboss-javaee-6.0-with-security”bom，但在您的依赖关系中，您使用的是javaee-web-api-7.0。 - Marcel Steinbach

Answer 1

你不应该混合使用EE6和7的pom文件，否则可能会导致应用程序出现问题。

首先，你应该替换

。

<dependency>
      <groupId>org.jboss.bom</groupId>
      <artifactId>jboss-javaee-6.0-with-security</artifactId>
      <version>${version.jboss.bom}</version>
      <type>pom</type>
      <scope>import</scope>
</dependency>

带着

<dependency>
      <groupId>org.wildfly.bom</groupId>
      <artifactId>jboss-javaee-7.0-with-security</artifactId>
      <version>8.0.0</version>
      <type>pom</scope>
      <scope>import</scope>
</dependency>

你也可以移除：

 <dependency>
      <groupId>javax</groupId>
      <artifactId>javaee-web-api</artifactId>
      <version>7.0</version>
      <scope>provided</scope>
  </dependency>

作为导入jboss-javaee-7.0-with-security pom的一部分，您已经获得了所有这些内容，但无论如何都不会有害。请注意替换

。

 <plugin>
          <groupId>org.jboss.as.plugins</groupId>
          <artifactId>jboss-as-maven-plugin</artifactId>
          <version>7.4.Final</version>
 </plugin>

使用：

<plugin>
      <groupId>org.wildfly.plugins</groupId>
      <artifactId>wildfly-maven-plugin</artifactId>
      <version>1.0.1.Final</version>
</plugin>

否则你将在部署到Wildfly时遇到问题，目标也已从jboss-as:deploy更改为wildfly:deploy

如果您的依赖树中存在重复的HTTP客户端，则应检查整个依赖树。

您可以通过运行以下命令来执行此操作：

mvn dependency:tree

它会告诉你哪些依赖项正在引入以及它们来自哪里。

顺便提一下，你应该升级到WildFly 8.0.0 Final。这与你的问题无关，但可以获得许多错误修复...

- Tomaz Cerar