I am getting this error:
[INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ cdt-hive ---
[INFO] Building jar: /Users/alexamil/WebstormProjects/cisco/cdt-hive/target/cdt-hive-1.0-SNAPSHOT.jar
[INFO]
[INFO] --- exec-maven-plugin:1.6.0:java (default-cli) @ cdt-hive ---
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/Users/alexamil/.m2/repository/org/slf4j/slf4j-log4j12/1.7.5/slf4j-log4j12-1.7.5.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/Users/alexamil/.m2/repository/org/apache/logging/log4j/log4j-slf4j-impl/2.4.1/log4j-slf4j-impl-2.4.1.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory]
Trying to connect!
[WARNING]
java.lang.IncompatibleClassChangeError: Implementing class
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at org.eclipse.jetty.server.ServerConnector.<init>(ServerConnector.java:97)
at spark.embeddedserver.jetty.SocketConnectorFactory.createSocketConnector(SocketConnectorFactory.java:45)
at spark.embeddedserver.jetty.EmbeddedJettyServer.ignite(EmbeddedJettyServer.java:96)
at spark.Service.lambda$init$0(Service.java:349)
at java.lang.Thread.run(Thread.java:745)
I can confirm that the error only occurs when I include the Spark route registration line indicated below by the ∆ symbol.
Here is the code I am running:
package cdt;
import org.apache.log4j.*;
import java.sql.*;
import static spark.Spark.*;
public class App {
final static Logger logger = Logger.getLogger(App.class);
public static void main(String[] args) throws ClassNotFoundException, SQLException {
BasicConfigurator.configure(); // configure log4j
Logger.getRootLogger().setLevel(Level.WARN);
get("/hello", (req, res) -> "Hello World"); // ∆ register Spark route
Class.forName("org.apache.hive.jdbc.HiveDriver");
System.out.println("Trying to connect!");
Connection con = DriverManager.getConnection("jdbc:hive2://hdprd1-edge-lb01:8888",
"hdpair", "Dat@_Infusi0n_1");
System.out.println("Connected!");
Statement stmt = con.createStatement();
String sql = ("show tables");
System.out.println("Trying to execute query!");
ResultSet res = stmt.executeQuery(sql);
System.out.println("Query executed!");
if (res.next()) {
System.out.println(res.getString(1));
} else {
System.out.println("Could not connect!");
}
}
}
and here is my pom.xml file:
<project>
<modelVersion>4.0.0</modelVersion>
<groupId>cdt</groupId>
<artifactId>cdt-hive</artifactId>
<packaging>jar</packaging>
<version>1.0-SNAPSHOT</version>
<name>cdt-hive</name>
<url>http://maven.apache.org</url>
<properties>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
</properties>
<build>
<plugins>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.6.0</version>
<configuration>
<mainClass>cdt.App</mainClass>
<arguments>
<argument>foo</argument>
<argument>bar</argument>
<argument>baz</argument>
</arguments>
</configuration>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.7.5</version>
</dependency>
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-client</artifactId>
<version>2.8.1</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.apache.hive</groupId>
<artifactId>hive-jdbc</artifactId>
<version>2.1.1</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.8.2</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.sparkjava</groupId>
<artifactId>spark-core</artifactId>
<version>2.5</version>
</dependency>
</dependencies>
</project>
Does anyone know what this error is about and how the Spark code call causes it? How to avoid it?
