Spring Boot Java . lang . noclassdeffounderror:javax/servlet/Filter

Question

我用Spring Boot 1.2.3启动了一个新项目。我发现了一个错误

java.lang.NoClassDefFoundError: javax/servlet/Filter

Gradle Dependencies：

dependencies {
    compile("org.springframework.boot:spring-boot-starter-actuator")
    compile("org.springframework.boot:spring-boot-starter-data-jpa")
    compile("org.springframework.boot:spring-boot-starter-security")
    compile("org.springframework.boot:spring-boot-starter-thymeleaf")
    compile("org.springframework.boot:spring-boot-starter-web")
    compile("org.codehaus.groovy:groovy")
    compile("com.h2database:h2")
    compile("org.thymeleaf.extras:thymeleaf-extras-springsecurity3")

    providedRuntime("org.springframework.boot:spring-boot-starter-tomcat")
    testCompile("org.springframework.boot:spring-boot-starter-test")

    compile 'org.webjars:jquery:2.1.4'
    compile 'org.webjars:bootstrap:3.3.4'
}

这是完整的堆栈跟踪

Exception in thread "main" java.lang.NoClassDefFoundError: javax/servlet/Filter
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
    at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
    at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
    at java.lang.Class.getDeclaredMethods0(Native Method)
    at java.lang.Class.privateGetDeclaredMethods(Class.java:2570)
    at java.lang.Class.getMethod0(Class.java:2813)
    at java.lang.Class.getMethod(Class.java:1663)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:125)
Caused by: java.lang.ClassNotFoundException: javax.servlet.Filter
    at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
    ... 29 more

Process finished with exit code 1

Answer 1

改变应用程序依赖关系的范围是不好的。将依赖项设置为compile，将在将要安装的工件中提供依赖项。最好的办法是按照文档中的说明来配置sping boot应用程序的运行配置:

“包括具有'提供的'作用域的依赖项”“启用此选项可将具有提供作用域的依赖项添加到运行时类路径中。

Answer 2

providedRuntime("org.springframework.boot:spring-boot-starter-tomcat")

这应该是

compile("org.springframework.boot:spring-boot-starter-tomcat")

Answer 3

对于maven用户，请注释以下依赖项中提供的范围：

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-tomcat</artifactId>
        <!--<scope>provided</scope>-->
    </dependency>

更新

正如feed.me提到的，您必须根据您正在部署的应用程序类型取消注释所提供的部分。

以下是包含详细信息的有用链接：http://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#build-tool-plugins-maven-packaging