java.lang.NoClassDefFoundError：连接Cassandra DB时ch/qos/logback/core/joran/spi/JoranException
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java.lang.NoClassDefFoundError: ch/qos/logback/core/joran/spi/JoranException while connecting Cassandra DB
提问by Anand Kumar
I was trying out a simple connection to my Cassandra instance through Java. I made a 'demo' keyspace to cqlsh and created a table in the java program. The code is below:
我正在尝试通过 Java 与我的 Cassandra 实例建立一个简单的连接。我为 cqlsh 创建了一个“演示”键空间，并在 java 程序中创建了一个表。代码如下：
Jars Used:
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','[email protected]','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"); } }
- 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','[email protected]','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"); } }
I am getting the following error:
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.run(Unknown Source)
at java.net.URLClassLoader.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$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 7 more
Exception in thread "main" java.lang.NoClassDefFoundError: ch/qos/logback/core/joran/spi/JoranException
at org.slf4j.LoggerFactory.bind(LoggerFactory.java:150)
at org.slf4j.LoggerFactory.performInitialization(LoggerFactory.java:124)
at org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:412)
at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:357)
at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:383)
at com.datastax.driver.core.Cluster.<clinit>(Cluster.java:60)
at CassandraConnection.main(CassandraConnection.java:21)
Caused by: java.lang.ClassNotFoundException: ch.qos.logback.core.joran.spi.JoranException
at java.net.URLClassLoader.run(Unknown Source)
at java.net.URLClassLoader.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 7 more
采纳答案by GhostCat
You have to make sure that the logbackJAR is within your classpath.
您必须确保logbackJAR 在您的类路径中。
See herefor starters; and beyond that; the real take-away here: the runtime is telling you that it can't find a certain class; and it gives you the fullname of that class. Or you look hereto read what Cassandra has to say about logback.
初学者请看这里；除此之外；真正的要点是：运行时告诉您它找不到某个类；它会为您提供该类的全名。或者您可以在这里阅读 Cassandra 对 logback 的看法。
You take that input; and then you turn to your favorite search engine in order to figure what is going on.
你接受那个输入；然后你转向你最喜欢的搜索引擎，以了解正在发生的事情。
回答by Rajeev Rathor
The root cause of this issue is the required jars not being available in the CLASSPATH. Please add the following dependencies - they will solve your issue.
此问题的根本原因是 CLASSPATH 中没有所需的 jar。请添加以下依赖项 - 它们将解决您的问题。
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-classic</artifactId>
<version>1.2.3</version>
</dependency>
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-classic</artifactId>
<version>1.2.3</version>
<exclusions>
<exclusion>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-core</artifactId>
<version>1.2.3</version>
</dependency>
