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连接Cassandra DB时java.lang.NoClassDefFoundError:ch / qos / logback / core / joran / spi / JoranExcepti
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我正在通过Java尝试与我的Cassandra实例的简单连接.我为cqlsh创建了一个’demo’键空间,并在java程序中创建了一个表.代码如下:
使用的罐子:
> slf4j.api-1.6.1
> cassandra-all-2.1.2
public class CassandraConnection {
public static void main(String[] args){
String ipAddress="127.0.0.1";
String keySpace="demo";
Cluster cluster;
Session session;
cluster=Cluster.builder().addContactPoint(ipAddress).build();
session=cluster.connect(keySpace);
System.out.println("====================Before insert");
String cqlInsertStmt="insert into users (lastname,age,city,email,firstname) values"
+"('Gopalan',32,'Paramakkudi','murugan@gmail.com','Murugan') ";
session.execute(cqlInsertStmt);
String cqlSelectStmt="select * from users";
ResultSet resultSet=session.execute(cqlSelectStmt);
System.out.println("=================After insert");
for(Row row: resultSet){
System.out.format("%s %s %d %s %s \n", row.getString("firstname"),row.getString("lastname"),row.getInt("age"),row.getString("city"),row.getString("email"));
}
System.out.println("=================After update");
}
}
我收到以下错误:
Failed to instantiate SLF4J LoggerFactory
Reported exception:
java.lang.NoClassDefFoundError: ch/qos/logback/core/joran/spi/JoranException
at org.slf4j.LoggerFactory.bind(LoggerFactory.java:150)
at org.slf4j.LoggerFactory.performInitialization(LoggerFactory.java:124)
at org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:412)
at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:357)
at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:383)
at com.datastax.driver.core.Cluster.<clinit>(Cluster.java:60)
at CassandraConnection.main(CassandraConnection.java:21)
Caused by: java.lang.ClassNotFoundException: ch.qos.logback.core.joran.spi.JoranException
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 7 more
Exception in thread "main" java.lang.NoClassDefFoundError: ch/qos/logback/core/joran/spi/JoranException
at org.slf4j.LoggerFactory.bind(LoggerFactory.java:150)
at org.slf4j.LoggerFactory.performInitialization(LoggerFactory.java:124)
at org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:412)
at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:357)
at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:383)
at com.datastax.driver.core.Cluster.<clinit>(Cluster.java:60)
at CassandraConnection.main(CassandraConnection.java:21)
Caused by: java.lang.ClassNotFoundException: ch.qos.logback.core.joran.spi.JoranException
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 7 more
解决方法:
您必须确保logback JAR在您的类路径中.
初学者见here;除此之外;真正的外卖:运行时告诉你它找不到某个类;它会为您提供该课程的全名.或者你看here阅读Cassandra关于logback的内容.
你接受了这个输入;然后你转向你最喜欢的搜索引擎,以便了解正在发生的事情.
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