Jackson databind runs in IDE but not in bank
I am trying to use jackson binding using Maven. It works fine in the IDE (I'm using IntelliJ IDEA), but when I try to create a jar with it, it throws an error on startup and crashes instantly. In particular, the error is this:
java.lang.NoClassDefFoundError: com/fasterxml/jackson/core/JsonFactory
This is JAR specific and I don't know why this is happening at all. What have I done wrong?
Here is the pom file:
<?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/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>me.zam</groupId>
<artifactId>jackson</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<dependencies>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.2.3</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.dataformat</groupId>
<artifactId>jackson-dataformat-yaml</artifactId>
<version>2.3.0</version>
</dependency>
</dependencies>
<build>
<plugins>
<!-- Make this jar executable -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<configuration>
<archive>
<manifest>
<!-- Jar file entry point -->
<mainClass>me.Main</mainClass>
<addClasspath>true</addClasspath>
</manifest>
</archive>
</configuration>
</plugin>
</plugins>
</build>
</project>
And here is the main object
package me;
import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.databind.ObjectMapper;
import java.io.File;
/**
* Created by Martin on 31/03/2017.
*/
public class Main
{
public static void main(String[] args)
{
ObjectMapper mapper = new ObjectMapper(new YAMLFactory());
try {
User user = mapper.readValue(new File("user.yaml"), User.class);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
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So I just tried to do this on my system and was able to reproduce the problem.
To solve it, you need to add one more plugin maven-shade-plugin
, which is needed to create a thick flask, that is, a flask with all the necessary dependencies.
Update the pom.xml file, notice, here I renamed the class that contains the method main
to Test
and put in the default package: -
<?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/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.so</groupId>
<artifactId>jackson</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<properties>
<mainClass>Test</mainClass>
</properties>
<dependencies>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.2.3</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.dataformat</groupId>
<artifactId>jackson-dataformat-yaml</artifactId>
<version>2.3.0</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<artifactId>maven-shade-plugin</artifactId>
<version>2.4.1</version>
<configuration>
<createDependencyReducedPom>true</createDependencyReducedPom>
<transformers>
<transformer implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer"/>
<transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<mainClass>${mainClass}</mainClass>
</transformer>
</transformers>
<!-- exclude signed Manifests -->
<filters>
<filter>
<artifact>*:*</artifact>
<excludes>
<exclude>META-INF/*.SF</exclude>
<exclude>META-INF/*.DSA</exclude>
<exclude>META-INF/*.RSA</exclude>
</excludes>
</filter>
</filters>
</configuration>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
</execution>
</executions>
</plugin>
<!-- Make this jar executable -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<configuration>
<archive>
<manifest>
<!-- Jar file entry point -->
<mainClass>Test</mainClass>
<addClasspath>true</addClasspath>
</manifest>
</archive>
</configuration>
</plugin>
</plugins>
</build>
</project>
After that, I ran the code by running the first command mvn clean package
, which creates a fat jar, and then ran the code with the command java -cp target/jackson-1.0-SNAPSHOT.jar Test
.
Let me know if you have any problems running the code.
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