找不到类当我尝试运行程序时出现异常
我使用mvn install下载了java bundle的所有依赖项。然后我编写了测试程序并编译了它。它编译没有错误。但是当我尝试运行它时，会抛出一个运行时异常：
Exception in thread "main" java.lang.NoClassDefFoundError: com/fasterxml/jackson/databind/Module
at Tester.main(Tester.java:8)
Caused by: java.lang.ClassNotFoundException: com.fasterxml.jackson.databind.Module
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 1 more
这是目标目录：
我已将Tester课程立即放在classes目录中。我已经验证了lib目录中存在com/fasterxml/jackson/databind/Module。
这可能是什么原因？
以下是java bundle附带的pom.xml：
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>io.swagger</groupId>
<artifactId>swagger-java-client</artifactId>
<packaging>jar</packaging>
<name>swagger-java-client</name>
<version>1.0.0</version>
<prerequisites>
<maven>2.2.0</maven>
</prerequisites>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.12</version>
<configuration>
<systemProperties>
<property>
<name>loggerPath</name>
<value>conf/log4j.properties</value>
</property>
</systemProperties>
<argLine>-Xms512m -Xmx1500m</argLine>
<parallel>methods</parallel>
<forkMode>pertest</forkMode>
</configuration>
</plugin>
<plugin>
<artifactId>maven-dependency-plugin</artifactId>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>copy-dependencies</goal>
</goals>
<configuration>
<outputDirectory>${project.build.directory}/lib</outputDirectory>
</configuration>
</execution>
</executions>
</plugin>
<!-- attach test jar -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>2.2</version>
<executions>
<execution>
<goals>
<goal>jar</goal>
<goal>test-jar</goal>
</goals>
</execution>
</executions>
<configuration>
</configuration>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>build-helper-maven-plugin</artifactId>
<version>1.10</version>
<executions>
<execution>
<id>add_sources</id>
<phase>generate-sources</phase>
<goals>
<goal>add-source</goal>
</goals>
<configuration>
<sources>
<source>src/main/java</source>
</sources>
</configuration>
</execution>
<execution>
<id>add_test_sources</id>
<phase>generate-test-sources</phase>
<goals>
<goal>add-test-source</goal>
</goals>
<configuration>
<sources>
<source>src/test/java</source>
</sources>
</configuration>
</execution>
</executions>
</plugin>
<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>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>io.swagger</groupId>
<artifactId>swagger-annotations</artifactId>
<version>${swagger-annotations-version}</version>
</dependency>
<!-- HTTP client: jersey-client -->
<dependency>
<groupId>com.sun.jersey</groupId>
<artifactId>jersey-client</artifactId>
<version>${jersey-version}</version>
</dependency>
<dependency>
<groupId>com.sun.jersey.contribs</groupId>
<artifactId>jersey-multipart</artifactId>
<version>${jersey-version}</version>
</dependency>
<!-- JSON processing: jackson -->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>${jackson-version}</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>${jackson-version}</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>${jackson-version}</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.jaxrs</groupId>
<artifactId>jackson-jaxrs-json-provider</artifactId>
<version>${jackson-version}</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.datatype</groupId>
<artifactId>jackson-datatype-joda</artifactId>
<version>2.1.5</version>
</dependency>
<dependency>
<groupId>joda-time</groupId>
<artifactId>joda-time</artifactId>
<version>${jodatime-version}</version>
</dependency>
<!-- Base64 encoding that works in both JVM and Android -->
<dependency>
<groupId>com.brsanthu</groupId>
<artifactId>migbase64</artifactId>
<version>2.2</version>
</dependency>
<!-- test dependencies -->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>${junit-version}</version>
<scope>test</scope>
</dependency>
</dependencies>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<swagger-annotations-version>1.5.8</swagger-annotations-version>
<jersey-version>1.18</jersey-version>
<jackson-version>2.4.2</jackson-version>
<jodatime-version>2.3</jodatime-version>
<maven-plugin-version>1.0.0</maven-plugin-version>
<junit-version>4.8.1</junit-version>
</properties>
清单文件：（jackson-databind-2.4.2.jar）
Manifest-Version: 1.0
Bnd-LastModified: 1407990182364
Build-Jdk: 1.7.0_55
Built-By: tatu
Bundle-Description: General data-binding functionality for Jackson: work
s on core streaming API
Bundle-DocURL: http://wiki.fasterxml.com/JacksonHome
Bundle-License: http://www.apache.org/licenses/LICENSE-2.0.txt
Bundle-ManifestVersion: 2
Bundle-Name: jackson-databind
Bundle-SymbolicName: com.fasterxml.jackson.core.jackson-databind
Bundle-Vendor: FasterXML
Bundle-Version: 2.4.2
Created-By: Apache Maven Bundle Plugin
Export-Package: com.fasterxml.jackson.databind;version="2.4.2",com.faste
rxml.jackson.databind.annotation;version="2.4.2",com.fasterxml.jackson.
databind.cfg;version="2.4.2",com.fasterxml.jackson.databind.deser;versi
on="2.4.2",com.fasterxml.jackson.databind.deser.impl;version="2.4.2",co
m.fasterxml.jackson.databind.deser.std;version="2.4.2",com.fasterxml.ja
ckson.databind.exc;version="2.4.2",com.fasterxml.jackson.databind.ext;v
ersion="2.4.2",com.fasterxml.jackson.databind.introspect;version="2.4.2
",com.fasterxml.jackson.databind.jsonschema;version="2.4.2",com.fasterx
ml.jackson.databind.jsonFormatVisitors;version="2.4.2",com.fasterxml.ja
ckson.databind.jsontype;version="2.4.2",com.fasterxml.jackson.databind.
jsontype.impl;version="2.4.2",com.fasterxml.jackson.databind.module;ver
sion="2.4.2",com.fasterxml.jackson.databind.node;version="2.4.2",com.fa
sterxml.jackson.databind.ser;version="2.4.2",com.fasterxml.jackson.data
bind.ser.impl;version="2.4.2",com.fasterxml.jackson.databind.ser.std;ve
rsion="2.4.2",com.fasterxml.jackson.databind.type;version="2.4.2",com.f
asterxml.jackson.databind.util;version="2.4.2"
Implementation-Build-Date: 2014-08-13 21:22:55-0700
Implementation-Title: jackson-databind
Implementation-Vendor: FasterXML
Implementation-Vendor-Id: com.fasterxml.jackson.core
Implementation-Version: 2.4.2
Import-Package: com.fasterxml.jackson.annotation;version="[2.4.0,2.5)",c
om.fasterxml.jackson.core;version="[2.4.2,2.5)",com.fasterxml.jackson.c
ore.base;version="[2.4.2,2.5)",com.fasterxml.jackson.core.format;versio
n="[2.4.2,2.5)",com.fasterxml.jackson.core.io;version="[2.4.2,2.5)",com
.fasterxml.jackson.core.json;version="[2.4.2,2.5)",com.fasterxml.jackso
n.core.type;version="[2.4.2,2.5)",com.fasterxml.jackson.core.util;versi
on="[2.4.2,2.5)",javax.xml.datatype,javax.xml.namespace,javax.xml.parse
rs,org.w3c.dom,org.w3c.dom.bootstrap,org.w3c.dom.ls,org.xml.sax
Specification-Title: jackson-databind
Specification-Vendor: FasterXML
Specification-Version: 2.4.2
Tool: Bnd-1.50.0
X-Compile-Source-JDK: 1.6
X-Compile-Target-JDK: 1.6
2 个答案:
答案 0 :(得分：0)
您缺少清单文件。 Adding Classes to the JAR File's Classpath
创建清单文件并在其中添加类路径：
Class-Path: jar1-name jar2-name directory-name/jar3-name
要自动生成清单类路径，请使用以下maven插件：
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>3.0.0</version>
<configuration>
<archive>
<index>true</index>
<manifest>
<addClasspath>true</addClasspath>
</manifest>
</archive>
</configuration>
</plugin>
答案 1 :(得分：-1)
试试这个 - ＆gt;
- 右键点击项目
- 点击Build Path - ＆gt;配置构建路径
- 然后在左侧面板中找到Deployement Assembly并单击此
- 在右侧点击添加
- 单击Java Build Path Entries
- 双击Maven Dependencies之后
- 点击Apply and Ok
- 重新部署您的代码。
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