java.lang.NoClassDefFoundError: com/blade/Blade

刘嘉先
java
Blade, NoClassDefFoundError
阅读量
文章目录
  1. 1. 报错
  2. 2. 解决方案
    1. 2.1. pom.xml
    2. 2.2. assembly.xml
  3. 3. 部署

下载了一个 blade 项目进行开发，开发完毕后，上线发现一直报错，查阅资料几乎没有此类问题，最后才发现是打的包不能和平常 springboot 的项目一样，直接使用 idea install,然后 JAVA -jar 执行

报错

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Exception in thread "main" java.lang.NoClassDefFoundError: com/blade/Blade
	at com.tale.Application.main(Application.java:15)
Caused by: java.lang.ClassNotFoundException: com.blade.Blade
	at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	... 1 more

解压 jar 包发现文件夹内的文件非常的少，期间尝试将 idea 执行产生的文件直接上传 tomcat，最后也是以失败收尾

解决方案

通过对比项目 tale 发现打包方式不一样，然后修改即可

pom.xml

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<plugins>
            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                    <encoding>UTF-8</encoding>
                </configuration>
            </plugin>
            <plugin>
                <artifactId>maven-assembly-plugin</artifactId>
                <configuration>
                    <appendAssemblyId>false</appendAssemblyId>
                    <descriptors>
                        <descriptor>assembly.xml</descriptor>
                    </descriptors>
                    <outputDirectory>${project.build.directory}/dist/</outputDirectory>
                </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>2.4</version>
                <configuration>
                    <archive>
                        <manifest>
                            <mainClass>com.sp.Application</mainClass>
                            <classpathPrefix>lib/</classpathPrefix>
                            <addClasspath>true</addClasspath>
                        </manifest>
                        <manifestEntries>
                            <Class-Path>resources/</Class-Path>
                        </manifestEntries>
                    </archive>
                </configuration>
            </plugin>
        </plugins>

assembly.xml

[colory]与 pom.xml 同一级[/colory]

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<assembly xmlns="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2 http://maven.apache.org/xsd/assembly-1.1.2.xsd">

    <id>bin</id>
    <formats>
        <format>tar.gz</format>
        <format>zip</format>
    </formats>

    <includeBaseDirectory>false</includeBaseDirectory>

    <fileSets>
        <fileSet>
            <directory>src/main/resources/</directory>
            <outputDirectory>/resources</outputDirectory>
        </fileSet>
        <fileSet>
            <directory>src/main/plugins/</directory>
            <outputDirectory>/plugins</outputDirectory>
        </fileSet>
        <fileSet>
            <directory>bin/</directory>
            <outputDirectory>/</outputDirectory>
        </fileSet>
    </fileSets>

    <dependencySets>
        <dependencySet>
            <outputDirectory>/lib</outputDirectory>
            <scope>runtime</scope>
            <excludes>
                <exclude>${project.groupId}:${project.artifactId}</exclude>
            </excludes>
        </dependencySet>
        <dependencySet>
            <outputDirectory>/</outputDirectory>
            <includes>
                <include>${project.groupId}:${project.artifactId}</include>
            </includes>
        </dependencySet>
    </dependencySets>
</assembly>

部署

  1. 在target 目录下的 dist 文件下有两个文件，解压 tar.gz 文件
  2. 执行以下命令
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    nohup java -jar ***.jar &

到此查看日志 nohup 可以看到启动成功的日志

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