時，我有以下幾點：java.lang.LinkageError的：裝載機約束衝突：解決方法

1. EJB在業務層

package ejb.x.y; 

@Stateless 
public class FileFormatConvertor { 
    public byte[] fromExcelToCsv(Workbook workbook, Sheet sheet, String delimiter) throws Exception { 
     ... 
}

2.豆在Web層

package web.x.y; 

@Named 
@SessionScoped 
public class FileUploadViewAction implements Serializable { 
    @EJB 
    private FileFormatConvertor fileFormatConvertor ; 
    // Other declarations 
    if (fileType == Type.EXCEL) { 
     bytesToUpload = fileFormatConvertor.fromExcelToCsv(workbook, sheet, delimiter); 
    } 
    // Rest of code 
}

3. POM文件

Ear pom.xml

<?xml version="1.0" encoding="UTF-8"?> 
<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> 
    <parent> 
     <artifactId>xy-portal</artifactId> 
     <groupId>com.xy</groupId> 
     <version>1.0-SNAPSHOT</version> 
    </parent> 
    <groupId>com.xy</groupId> 
    <artifactId>ear-x-y</artifactId> 
    <version>${project.version}</version> 
    <packaging>ear</packaging> 
    <name>ear-x-y</name> 
    <properties> 
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> 
    </properties> 
    <build> 
     <finalName>ear-x-y</finalName> 
     <plugins> 
      <plugin> 
       <groupId>org.apache.maven.plugins</groupId> 
       <artifactId>maven-compiler-plugin</artifactId> 
       <version>2.3.2</version> 
       <configuration> 
        <source>1.6</source> 
        <target>1.6</target> 
       </configuration> 
      </plugin> 
      <plugin> 
       <groupId>org.apache.maven.plugins</groupId> 
       <artifactId>maven-ear-plugin</artifactId> 
       <version>2.6</version> 
       <configuration> 
        <version>6</version> 
        <defaultLibBundleDir>lib</defaultLibBundleDir> 
        <modules> 
         <webModule> 
          <groupId>com.xy</groupId> 
          <artifactId>web-x-y</artifactId> 
          <contextRoot>/xy</contextRoot> 
          <bundleFileName>xy-portal-web.war</bundleFileName> 
         </webModule> 
         <ejbModule> 
          <groupId>com.xy</groupId> 
          <artifactId>ejb-x-y</artifactId> 
          <bundleFileName>xy-portal-ejb.jar</bundleFileName> 
         </ejbModule> 
        </modules> 
       </configuration> 
      </plugin> 
      <plugin> 
       <groupId>org.jboss.as.plugins</groupId> 
       <artifactId>jboss-as-maven-plugin</artifactId> 
       <configuration> 
        <skip>false</skip> 
        <hostname>0.0.0.0</hostname> 
        <!--<hostname>xy</hostname>--> 
        <port>0000</port> 
        <filename>xy-portal-ear.ear</filename> 
       </configuration> 
      </plugin> 
     </plugins> 
    </build> 
    <dependencies> 
     <dependency> 
      <groupId>com.xy</groupId> 
      <artifactId>xy-portal-ejb</artifactId> 
      <version>${project.version}</version> 
      <type>ejb</type> 
     </dependency> 
     <dependency> 
      <groupId>com.xy</groupId> 
      <artifactId>xy-portal-web</artifactId> 
      <version>${project.version}</version> 
      <type>war</type> 
     </dependency> 
     <dependency> 
      <groupId>org.jboss.resteasy</groupId> 
      <artifactId>resteasy-jaxb-provider</artifactId> 
      <version>2.3.1.GA</version> 
     </dependency> 
     <dependency> 
      <groupId>org.jboss.resteasy</groupId> 
      <artifactId>resteasy-jaxrs</artifactId> 
      <version>2.3.1.GA</version> 
     </dependency> 
     <dependency> 
      <groupId>${project.groupId}</groupId> 
      <artifactId>xy-client</artifactId> 
      <version>${project.version}</version> 
     </dependency> 
     <dependency> 
      <groupId>${project.groupId}</groupId> 
      <artifactId>xy-datamodel</artifactId> 
      <version>${project.version}</version> 
     </dependency>  
    </dependencies>  
</project>

的ejb的pom.xml

<?xml version="1.0" encoding="UTF-8"?> 
<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> 
    <parent> 
     <artifactId>xy-portal</artifactId> 
     <groupId>com.xy</groupId> 
     <version>1.0-SNAPSHOT</version> 
    </parent> 
    <groupId>com.xy</groupId> 
    <artifactId>xy-portal-ejb</artifactId> 
    <version>${project.version}</version> 
    <packaging>ejb</packaging> 
    <name>xy-portal-ejb</name> 
    <properties> 
     <endorsed.dir>${project.build.directory}/endorsed</endorsed.dir> 
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> 
    </properties> 
    <dependencies>   
     <dependency> 
      <groupId>org.jboss.as</groupId> 
      <artifactId>jboss-as-ejb3</artifactId> 
      <version>7.1.2.Final</version> 
      <scope>provided</scope> 
      <exclusions> 
       <exclusion> 
        <groupId>org.hibernate</groupId> 
        <artifactId>hibernate-validator</artifactId> 
       </exclusion> 
      </exclusions> 
     </dependency>  
     <dependency> 
      <groupId>org.jboss.spec</groupId> 
      <artifactId>jboss-javaee-6.0</artifactId> 
      <version>3.0.3.Final</version> 
      <type>pom</type> 
      <scope>provided</scope> 
     </dependency> 
     <dependency> 
      <groupId>org.infinispan</groupId> 
      <artifactId>infinispan-core</artifactId> 
      <version>6.0.2.Final</version> 
     </dependency>   
     <dependency> 
      <groupId>org.apache.poi</groupId> 
      <artifactId>poi</artifactId> 
      <version>3.14</version> 
     </dependency> 
     <dependency> 
      <groupId>org.apache.poi</groupId> 
      <artifactId>poi-ooxml</artifactId> 
      <version>3.14</version> 
     </dependency> 
     <dependency> 
      <groupId>org.apache.poi</groupId> 
      <artifactId>poi-ooxml-schemas</artifactId> 
      <version>3.14</version> 
     </dependency> 
     <dependency> 
      <groupId>dom4j</groupId> 
      <artifactId>dom4j</artifactId> 
      <version>1.6.1</version> 
     </dependency>   
     <dependency> 
      <groupId>org.testng</groupId> 
      <artifactId>testng</artifactId>       
      <scope>test</scope> 
     </dependency> 
     <dependency> 
      <groupId>org.jboss.arquillian.testng</groupId> 
      <artifactId>arquillian-testng-container</artifactId> 
      <scope>test</scope> 
     </dependency>  
     <dependency> 
      <groupId>org.jboss.shrinkwrap.resolver</groupId> 
      <artifactId>shrinkwrap-resolver-api</artifactId> 
      <scope>test</scope> 
     </dependency>  
     <dependency> 
      <groupId>org.jboss.shrinkwrap.resolver</groupId> 
      <artifactId>shrinkwrap-resolver-api-maven</artifactId> 
      <scope>test</scope> 
     </dependency> 
     <dependency> 
      <groupId>org.jboss.shrinkwrap.resolver</groupId> 
      <artifactId>shrinkwrap-resolver-api-maven-archive</artifactId> 
      <scope>test</scope>   
     </dependency> 
     <dependency> 
      <groupId>org.jboss.shrinkwrap.resolver</groupId> 
      <artifactId>shrinkwrap-resolver-impl-maven-archive</artifactId> 
      <scope>test</scope>   
     </dependency> 
     <dependency> 
      <groupId>org.eu.ingwar.tools</groupId> 
      <artifactId>arquillian-suite-extension</artifactId>   
      <scope>test</scope> 
     </dependency>  
     <dependency> 
      <groupId>commons-io</groupId> 
      <artifactId>commons-io</artifactId> 
      <version>2.2</version> 
      <scope>test</scope> 
     </dependency> 
     <dependency> 
      <groupId>com.opencsv</groupId> 
      <artifactId>opencsv</artifactId> 
      <version>3.7</version> 
      <scope>test</scope> 
     </dependency>    
    </dependencies> 
    <build> 
     <plugins> 
      <plugin> 
       <groupId>org.apache.maven.plugins</groupId> 
       <artifactId>maven-compiler-plugin</artifactId> 
       <version>2.3.2</version> 
       <configuration> 
        <source>1.7</source> 
        <target>1.7</target> 
       </configuration> 
      </plugin> 
      <plugin> 
       <groupId>org.apache.maven.plugins</groupId> 
       <artifactId>maven-ejb-plugin</artifactId> 
       <version>2.3</version> 
       <configuration> 
        <ejbVersion>3.1</ejbVersion> 
        <archive> 
         <manifestEntries> 
          <Dependencies>org.infinispan export</Dependencies> 
         </manifestEntries> 
        </archive> 
       </configuration> 
      </plugin>  
     </plugins> 
    </build> 
</project>

網絡的pom.xml

<?xml version="1.0" encoding="UTF-8"?> 
<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> 
    <parent> 
     <artifactId>xy-portal</artifactId> 
     <groupId>com.xy</groupId> 
     <version>1.0-SNAPSHOT</version> 
    </parent> 

    <artifactId>xy-portal-web</artifactId> 
    <version>${project.version}</version> 
    <packaging>war</packaging> 

    <name>xy-portal-web</name> 

    <properties> 
     <endorsed.dir>${project.build.directory}/endorsed</endorsed.dir> 
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> 
    </properties> 

    <dependencies> 
     <dependency> 
      <groupId>org.apache.poi</groupId> 
      <artifactId>poi</artifactId> 
      <version>3.14</version> 
     </dependency> 
     <dependency> 
      <groupId>org.apache.poi</groupId> 
      <artifactId>poi-ooxml</artifactId> 
      <version>3.14</version> 
     </dependency> 
     <dependency> 
      <groupId>org.apache.poi</groupId> 
      <artifactId>poi-ooxml-schemas</artifactId> 
      <version>3.14</version> 
     </dependency> 
     <dependency> 
      <groupId>dom4j</groupId> 
      <artifactId>dom4j</artifactId> 
      <version>1.6.1</version> 
     </dependency> 

     <dependency> 
      <groupId>org.primefaces.themes</groupId> 
      <artifactId>all-themes</artifactId> 
      <version>1.0.10</version> 
     </dependency> 

     <dependency> 
      <groupId>org.primefaces</groupId> 
      <artifactId>primefaces</artifactId> 
      <version>5.2</version> 
     </dependency> 

     <dependency> 
      <groupId>org.omnifaces</groupId> 
      <artifactId>omnifaces</artifactId> 
      <version>1.8.1</version> 
     </dependency> 

     <dependency> 
      <groupId>org.primefaces.extensions</groupId> 
      <artifactId>primefaces-extensions</artifactId> 
      <version>3.2.0</version> 
     </dependency> 

     <dependency> 
      <groupId>org.webjars</groupId> 
      <artifactId>font-awesome</artifactId> 
      <version>4.6.1</version> 
     </dependency>  

     <dependency> 
      <groupId>commons-fileupload</groupId> 
      <artifactId>commons-fileupload</artifactId> 
      <version>1.3</version> 
     </dependency> 
     <dependency> 
      <groupId>commons-io</groupId> 
      <artifactId>commons-io</artifactId> 
      <version>2.2</version> 
     </dependency> 
     <dependency> 
      <groupId>${project.groupId}</groupId> 
      <artifactId>xy-client</artifactId> 
      <version>${project.version}</version> 
      <scope>provided</scope> 
      <exclusions>     
       <exclusion> 
        <groupId>org.hibernate</groupId> 
        <artifactId>hibernate-validator</artifactId> 
       </exclusion> 
      </exclusions> 
     </dependency> 
     <dependency> 
      <groupId>${project.groupId}</groupId> 
      <artifactId>xy-portal-ejb</artifactId> 
      <version>${project.version}</version> 
      <scope>provided</scope> 
     </dependency> 
     <dependency> 
      <groupId>${project.groupId}</groupId> 
      <artifactId>xy-datamodel</artifactId> 
      <version>${project.version}</version> 
      <scope>provided</scope> 
      <exclusions> 
       <exclusion> 
        <groupId>javax.validation</groupId> 
        <artifactId>validation-api</artifactId> 
       </exclusion> 
       <exclusion> 
        <groupId>org.hibernate</groupId> 
        <artifactId>hibernate-validator</artifactId> 
       </exclusion> 
       <exclusion> 
        <groupId>org.hibernate</groupId> 
        <artifactId>hibernate-jpamodelgen</artifactId> 
       </exclusion> 
      </exclusions> 
     </dependency> 
     <dependency> 
      <groupId>org.jboss.resteasy</groupId> 
      <artifactId>resteasy-jaxb-provider</artifactId> 
      <version>2.3.1.GA</version> 
     </dependency> 
     <dependency> 
      <groupId>org.jboss.resteasy</groupId> 
      <artifactId>resteasy-jaxrs</artifactId> 
      <version>2.3.1.GA</version> 
     </dependency> 
     <dependency> 
      <groupId>org.testng</groupId> 
      <artifactId>testng</artifactId> 
      <version>6.8.1</version> 
      <scope>test</scope> 
     </dependency> 
     <dependency> 
      <groupId>org.jboss.resteasy</groupId> 
      <artifactId>jaxrs-api</artifactId> 
      <version>3.0.8.Final</version> 
      <scope>test</scope> 
     </dependency> 
     <dependency> 
      <groupId>log4j</groupId> 
      <artifactId>log4j</artifactId> 
      <version>1.2.17</version> 
     </dependency> 
     <dependency> 
      <groupId>org.hibernate</groupId> 
      <artifactId>hibernate-validator</artifactId> 
      <version>5.1.2.Final</version> 
     </dependency> 
     <dependency> 
      <groupId>org.jboss.spec</groupId> 
      <artifactId>jboss-javaee-web-6.0</artifactId> 
      <version>3.0.3.Final</version> 
      <type>pom</type> 
      <scope>provided</scope> 
     </dependency> 
     <dependency> 
      <groupId>junit</groupId> 
      <artifactId>junit</artifactId> 
      <version>4.8.1</version> 
      <scope>test</scope> 
     </dependency> 
     <dependency> 
      <groupId>jboss</groupId> 
      <artifactId>jbosssx</artifactId> 
      <version>3.2.3</version> 
      <scope>provided</scope> 
     </dependency> 
     <dependency> 
      <groupId>jboss</groupId> 
      <artifactId>jboss-jaas</artifactId> 
      <version>3.2.3</version> 
      <scope>provided</scope> 
     </dependency> 
     <dependency> 
      <groupId>net.glxn</groupId> 
      <artifactId>qrgen</artifactId> 
      <version>1.4</version> 
     </dependency> 
     <dependency> 
      <groupId>net.sf.barcode4j</groupId> 
      <artifactId>barcode4j-light</artifactId> 
      <version>2.0</version> 
     </dependency> 
     <dependency> 
      <groupId>jexcelapi</groupId> 
      <artifactId>jxl</artifactId> 
      <version>2.6</version> 
     </dependency> 
    </dependencies> 
    <build> 
     <plugins> 
      <plugin> 
       <groupId>org.apache.maven.plugins</groupId> 
       <artifactId>maven-compiler-plugin</artifactId> 
       <version>2.3.2</version> 
       <configuration> 
        <source>1.7</source> 
        <target>1.7</target> 
       </configuration> 
      </plugin> 
      <plugin> 
       <groupId>org.apache.maven.plugins</groupId> 
       <artifactId>maven-war-plugin</artifactId> 
       <version>2.1.1</version> 
       <configuration> 
        <failOnMissingWebXml>false</failOnMissingWebXml> 
       </configuration> 
      </plugin>   
     </plugins> 
    </build> 
</project>

4.異常

Caused by: javax.faces.el.EvaluationException: java.lang.LinkageError: loader constraint violation: when resolving method "ejb.x.y.FileFormatConvertor.fromExcelToCsv(Lorg/apache/poi/ss/usermodel/Workbook;Lorg/apache/poi/ss/usermodel/Sheet;Ljava/lang/String;)[B" the class loader (instance of org/jboss/modules/ModuleClassLoader) of the current class, web.x.y.FileUploadViewAction, and the class loader (instance of org/jboss/modules/ModuleClassLoader) for resolved class, ejb.x.y.FileFormatConvertor, have different Class objects for the type Lorg/apache/poi/ss/usermodel/Workbook;Lorg/apache/poi/ss/usermodel/Sheet;Ljava/lang/String;)[B used in the signature 
    at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:102) [jboss-jsf-api_2.1_spec-2.0.1.Final.jar:2.0.1.Final] 
    at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102) [jsf-impl-2.1.7-jbossorg-2.jar:] 
    ... 36 more

什麼我做錯了要得到這個例外？到目前爲止，我已經做了以下： 1.檢查循環類路徑依賴 2.將EJB到Web層作爲託管bean（解決了這個問題，但豆是由其他客戶端訪問其他地方，使業務層更自然家園） 3.搜索這個網站的類似問題/解決方案的路徑，只發現沒有

請幫助...

來源

2016-05-13 Bell Katapa

你的戰爭和ejb.jar各有自己的類加載器，所以每個類加載器都有自己的poi類的定義。

你應該嘗試把POI罐子和所有普通的罐子您ejb.jar和戰爭耳/ lib目錄下。將依賴關係標記爲在您的pom.xml中爲ejb.jar和war提供。

這樣，戰爭和ejb.jar將繼承由他們的父類加載器，耳類加載器定義的類。

你不應該試圖通過在一個類加載器定義的類裝載器的另一個類，但用在一個共同的類加載器定義的類。

來源

2016-05-13 11:17:40 mvera

EAR classloader沒有這樣的東西。 EAR文件的lib目錄中的所有jar都被認爲是在它們自己的模塊中，這使EAR中的模塊（如EJB jar和WAR文件）可見。 EAR/lib模塊有效地獲得了自己的類加載器，但它肯定不是「父類」。否則你的答案很好。 –

謝謝mvera。這就像魅力一樣 –

我得到了這個工作。我的回答只是強調了mvera在這裏所說的。 E.g.戰爭和EJB模塊兩個pom.xml的內容共享以下依賴性：

<dependencies> 
... 
    <dependency> 
      <groupId>org.apache.poi</groupId> 
      <artifactId>poi</artifactId> 
      <version>3.14</version>   
    </dependency> 
... 
</dependencies>

這裏是我做了什麼......

拷貝依賴項（和所有共享依賴）的POM .xml放在耳機模塊中。

標記爲在你的EJB和戰爭模塊的pom.xml文件中提供共享的依賴，使得在pom.xml文件產生的依賴項現在類似於下面

<dependency> 
     <groupId>org.apache.poi</groupId> 
     <artifactId>poi</artifactId> 
     <version>3.14</version> 
     <scope>provided</scope> 
</dependency>

重建項目！

來源

2016-05-16 08:19:57

java.lang.LinkageError的：裝載機約束衝突：解決方法

1. EJB在業務層

2.豆在Web層

3. POM文件

4.異常

回答

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