Question

在本地，我的Web项目需要asm-3.3.1.jar。如果我在pom.xml中编写它，则无法正常工作。但是，如果我将asm放在tomcat / lib文件夹中，那么一切看起来都很完美，并且我可以访问我的服务。

现在，我将我的项目部署到了digitalocean上的远程tomcat。我将asm-3.3.1.jar复制到远程tomcat / lib文件夹中。我可以顺利看到它。但是当我尝试访问我的项目时，出现错误，好像它没有将jar添加到tomcat / lib文件夹中一样。

我四处寻找可以找到的地方，但是找不到解决方法。

我在下面添加了有关该项目的一些屏幕截图：

我的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/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>app</groupId>
    <artifactId>story</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>war</packaging>
    <build>
        <sourceDirectory>src</sourceDirectory>
        <plugins>
            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.5.1</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
            <plugin>
                <artifactId>maven-war-plugin</artifactId>
                <version>3.0.0</version>
                <configuration>
                    <warSourceDirectory>WebContent</warSourceDirectory>
                </configuration>
            </plugin>
        </plugins>
    </build>
    <dependencies>
        <dependency>
            <groupId>com.sun.jersey</groupId>
            <artifactId>jersey-server</artifactId>
            <version>1.8</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.containers</groupId>
            <artifactId>jersey-container-servlet</artifactId>
            <version>2.7</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.media</groupId>
            <artifactId>jersey-media-jaxb</artifactId>
            <version>2.23.1</version>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>javax.ws.rs</groupId>
            <artifactId>javax.ws.rs-api</artifactId>
            <version>2.0.1</version>
        </dependency>
        <dependency>
            <groupId>org.jboss.resteasy</groupId>
            <artifactId>jaxrs-api</artifactId>
            <version>3.0.12.Final</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.bundles</groupId>
            <artifactId>jaxrs-ri</artifactId>
            <version>2.17</version>
        </dependency>
        <dependency>
            <groupId>org.lucee</groupId>
            <artifactId>postgresql</artifactId>
            <version>8.3-606.jdbc4</version>
        </dependency>
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>
        <dependency>
            <groupId>com.google.code.gson</groupId>
            <artifactId>gson</artifactId>
            <version>2.2.2</version>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>org.postgresql</groupId>
            <artifactId>postgresql</artifactId>
            <version>42.2.2</version>
        </dependency>
        <dependency>
            <groupId>asm</groupId>
            <artifactId>asm</artifactId>
            <version>3.3.1</version>
            <scope>provided</scope>
        </dependency>
    </dependencies>
</project>

我的远程tomcat的lib文件夹。您可以在此处看到asm jar。

我部署的war文件的内容：

Tomcat catalina.log（看起来不错）：

10-Sep-2018 17:21:06.914 INFO [http-nio-8080-exec-38] com.sun.jersey.api.core.PackagesResourceConfig.init Scanning for root resource and provider classes in the packages:
  com.sove.service
10-Sep-2018 17:21:50.654 INFO [http-nio-8080-exec-40] com.sun.jersey.api.core.PackagesResourceConfig.init Scanning for root resource and provider classes in the packages:
  com.sove.service
10-Sep-2018 17:21:51.391 INFO [http-nio-8080-exec-35] com.sun.jersey.api.core.PackagesResourceConfig.init Scanning for root resource and provider classes in the packages:
  com.sove.service
10-Sep-2018 17:21:52.047 INFO [http-nio-8080-exec-36] com.sun.jersey.api.core.PackagesResourceConfig.init Scanning for root resource and provider classes in the packages:
  com.sove.service
10-Sep-2018 17:22:34.963 INFO [http-nio-8080-exec-39] com.sun.jersey.api.core.PackagesResourceConfig.init Scanning for root resource and provider classes in the packages:
  com.sove.service
10-Sep-2018 17:54:12.144 INFO [http-nio-8080-exec-42] org.apache.catalina.core.StandardContext.reload Reloading Context with name [/sove] has started
10-Sep-2018 17:54:12.676 INFO [http-nio-8080-exec-42] org.apache.jasper.servlet.TldScanner.scanJars At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were $
10-Sep-2018 17:54:12.705 INFO [http-nio-8080-exec-42] com.sun.jersey.api.core.PackagesResourceConfig.init Scanning for root resource and provider classes in the packages:
  com.sove.service
10-Sep-2018 17:54:12.733 INFO [http-nio-8080-exec-42] org.apache.catalina.core.StandardContext.reload Reloading Context with name [/sove] is completed
10-Sep-2018 17:54:38.531 INFO [http-nio-8080-exec-43] com.sun.jersey.api.core.PackagesResourceConfig.init Scanning for root resource and provider classes in the packages:
  com.sove.service

这是错误：

HTTP Status 500 – Internal Server Error
Type Exception Report

Message Servlet.init() for servlet [Jersey RESTful Application] threw exception

Description The server encountered an unexpected condition that prevented it from fulfilling the request.

Exception

javax.servlet.ServletException: Servlet.init() for servlet [Jersey RESTful Application] threw exception
    org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:493)
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
    org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:650)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
    org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:800)
    org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
    org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:806)
    org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1498)
    org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
    java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    java.lang.Thread.run(Thread.java:748)
Root Cause

java.lang.NoClassDefFoundError: org/objectweb/asm/ClassVisitor
    com.sun.jersey.api.core.ScanningResourceConfig.init(ScanningResourceConfig.java:79)
    com.sun.jersey.api.core.PackagesResourceConfig.init(PackagesResourceConfig.java:104)
    com.sun.jersey.api.core.PackagesResourceConfig.<init>(PackagesResourceConfig.java:78)
    com.sun.jersey.api.core.PackagesResourceConfig.<init>(PackagesResourceConfig.java:89)
    com.sun.jersey.spi.container.servlet.WebComponent.createResourceConfig(WebComponent.java:696)
    com.sun.jersey.spi.container.servlet.WebComponent.createResourceConfig(WebComponent.java:674)
    com.sun.jersey.spi.container.servlet.WebComponent.init(WebComponent.java:203)
    com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:374)
    com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:557)
    javax.servlet.GenericServlet.init(GenericServlet.java:158)
    org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:493)
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
    org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:650)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
    org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:800)
    org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
    org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:806)
    org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1498)
    org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
    java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    java.lang.Thread.run(Thread.java:748)
Root Cause

java.lang.ClassNotFoundException: org.objectweb.asm.ClassVisitor
    org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1309)
    org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1137)
    com.sun.jersey.api.core.ScanningResourceConfig.init(ScanningResourceConfig.java:79)
    com.sun.jersey.api.core.PackagesResourceConfig.init(PackagesResourceConfig.java:104)
    com.sun.jersey.api.core.PackagesResourceConfig.<init>(PackagesResourceConfig.java:78)
    com.sun.jersey.api.core.PackagesResourceConfig.<init>(PackagesResourceConfig.java:89)
    com.sun.jersey.spi.container.servlet.WebComponent.createResourceConfig(WebComponent.java:696)
    com.sun.jersey.spi.container.servlet.WebComponent.createResourceConfig(WebComponent.java:674)
    com.sun.jersey.spi.container.servlet.WebComponent.init(WebComponent.java:203)
    com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:374)
    com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:557)
    javax.servlet.GenericServlet.init(GenericServlet.java:158)
    org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:493)
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
    org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:650)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
    org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:800)
    org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
    org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:806)
    org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1498)
    org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
    java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    java.lang.Thread.run(Thread.java:748)
Note The full stack trace of the root cause is available in the server logs.

Apache Tomcat/8.5.33

有什么想法吗？谢谢。 sfmbe。

Answer 1

我认为您不应在tomcat / lib和war文件中使用相同的JAR。将asm jar放入libs后，可以在pom.xml中设置提供的依赖项。

<dependency>
 <groupId>asm</groupId>
 <artifactId>asm</artifactId>
 <version>3.3.1</version> 
 <scope>provided</scope>
</dependency>

了解有关tomcat类加载器https://tomcat.apache.org/tomcat-7.0-doc/class-loader-howto.html

的更多信息

Tomcat-将War部署到远程tomcat时出现NoClassDefFoundError

1 个答案: