Been on this one for a few days now. I have a java servlet, built with maven that will be deployed to Jetty (an older version). It’s a RESTful web service on Jetty built with RESTEasy and Jackson, and the Jackson Mongo Mapper to connect me to MongoDB.
I can run the application from maven/jetty just fine (using mvn jetty:run), and it returns JSON as expected for queries that don’t use the Jackson Mongo Mapper/Jackson bit. When I send a request that triggers Jackson and the mapper, however, I first get this error:
java.lang.NoClassDefFoundError: org/codehaus/jackson/map/deser/std/StdDeserializer
When I submit a second time (and all subsequent requests), I get this error:
java.lang.NoClassDefFoundError: Could not initialize class net.vz.mongodb.jackson.JacksonDBCollection
As nearly as I can tell, I have all the dependencies set up correctly, although I’ll include my web.xml and pom.xml at the end of the question. If it isn’t a dependency, it’s occurred to me that there might be some issue with how my bean (BillItem.class) is getting passed. I’m relatively new to Java so this could easily be a stupid mistake rather than something related to the specific stack I’m trying to implement…any ideas of what is going on?
Here’s my web.xml:
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
version="2.5">
<welcome-file-list>
<welcome-file>index.html</welcome-file>
</welcome-file-list>
<!--
<context-param>
<param-name>resteasy.scan</param-name>
<param-value>true</param-value>
</context-param> -->
<context-param>
<param-name>resteasy.resources</param-name>
<param-value>com.myproject.BillServer</param-value>
</context-param>
<context-param>
<param-name>javax.ws.rs.Application</param-name>
<param-value>com.myproject.Service</param-value>
</context-param>
<context-param>
<param-name>resteasy.resource.method-interceptors</param-name>
<param-value>org.jboss.resteasy.core.ResourceMethodSecurityInterceptor</param-value>
</context-param>
<listener>
<listener-class>org.jboss.resteasy.plugins.server.servlet.ResteasyBootstrap</listener-class>
</listener>
<servlet>
<servlet-name>Resteasy</servlet-name>
<servlet-class>org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>Resteasy</servlet-name>
<url-pattern>/*</url-pattern>
</servlet-mapping>
</web-app>
Here’s my pom.xml:
<?xml version="1.0" encoding="UTF-8"?>
<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>com.myproject</groupId>
<version>0.0.1-SNAPSHOT</version>
<name>MyProject</name>
<artifactId>MyProject</artifactId>
<packaging>jar</packaging>
<properties>
<java.version>1.6</java.version>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<!-- Servlet API -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
</dependency>
<!-- Jetty -->
<dependency>
<groupId>org.eclipse.jetty</groupId>
<artifactId>jetty-webapp</artifactId>
<version>8.1.7.v20120910</version>
</dependency>
<dependency>
<groupId>org.mortbay.jetty</groupId>
<artifactId>jsp-2.1-glassfish</artifactId>
<version>2.1.v20100127</version>
</dependency>
<dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-jackson-provider</artifactId>
<version>2.3.4.Final</version>
</dependency>
<dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-jaxrs</artifactId>
<version>2.3.4.Final</version>
</dependency>
<dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>jaxrs-api</artifactId>
<version>2.3.4.Final</version>
</dependency>
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-core-asl</artifactId>
<version>1.9.9</version>
</dependency>
<dependency>
<groupId>net.vz.mongodb.jackson</groupId>
<artifactId>mongo-jackson-mapper</artifactId>
<version>1.4.2</version>
</dependency>
<dependency>
<groupId>org.mongodb</groupId>
<artifactId>mongo-java-driver</artifactId>
<version>2.9.1</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.mortbay.jetty</groupId>
<artifactId>jetty-maven-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.3.2</version>
<configuration>
<source>${java.version}</source>
<target>${java.version}</target>
</configuration>
</plugin>
<!-- The maven app assembler plugin will generate a script that sets up the classpath and runs your project -->
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>appassembler-maven-plugin</artifactId>
<version>1.1.1</version>
<configuration>
<assembleDirectory>target</assembleDirectory>
<programs>
<program>
<mainClass>com.MyProject.Main</mainClass>
<name>webapp</name>
</program>
</programs>
<useAllProjectDependencies>true</useAllProjectDependencies>
</configuration>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>assemble</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
And the last line of the following is the offending call that’s throwing the error:
Mongo mongo = new Mongo(MONGO_PATH, MONGO_PORT);
DB db = mongo.getDB(MONGO_APPDB);
DBCollection collection = db.getCollection(MONGO_BILL_COL);
JacksonDBCollection<BillItem, String> coll = JacksonDBCollection.wrap(collection, BillItem.class, String.class);
This was some serious idiocy. I accidentally deleted 3 of the jackson dependencies when I was cleaning up my pom file.