在我的本地,我的web项目需要asm-3.3.1.jar。如果我用pom.xml编写它,它就不能工作。但是如果我把asm放到tomcat/lib文件夹中,一切看起来都很完美,我可以访问我的服务了。
现在,我将我的项目部署到了digitalocean上的远程tomcat上。我将asm-3.3.1.jar复制到远程tomcat/lib文件夹。我可以看到,当我试图访问我的项目时,我得到一个错误,好像它没有将smoothly.But添加到tomcat/lib文件夹中。
我找遍了所有我能找到的地方,但我找不到解决办法。
我在下面添加了一些关于该项目的截图:
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。你可以在这里看到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。
发布于 2018-09-15 03:13:32
最后,
我发现了问题。正如我所说的,我在tomcat lib文件夹中有asm jar。当我在本地执行project时,project从tomcat获取asm类。但是如果我将项目部署到远程服务器上的tomcat,它就不能在任何地方接受类。
所以我从tomcat中删除了jar。然后我在pom.xml中添加了asm依赖项。在maven安装之后,我将jar添加到项目源代码中。(右键单击项目-属性-部署程序集-添加-java构建路径条目- maven依赖项。)
我希望这对某些人有帮助。
发布于 2018-09-11 03:19:27
我认为您不应该在tomcat/lib和war文件中使用相同的JAR。当您将asm jar放入库中时,您可以在pom.xml中设置所提供的依赖项。
<dependency>
<groupId>asm</groupId>
<artifactId>asm</artifactId>
<version>3.3.1</version>
<scope>provided</scope>
</dependency>
阅读有关tomcat类加载器https://tomcat.apache.org/tomcat-7.0-doc/class-loader-howto.html的更多信息
https://stackoverflow.com/questions/52263655
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