[英]Handling exception in WebClient throws io.netty.handler.timeout.ReadTimeoutException
[英]NoClassDefFoundError: io/netty/handler/timeout/IdleStateHandler Datastax dse java driver
我正在尝试用我的Java代码连接ubuntu上的DSE 5.0服务器(启用图形),但出现此错误
Exception in thread "main" java.lang.NoClassDefFoundError: io/netty/handler/timeout/IdleStateHandler
at com.datastax.driver.core.Connection$Initializer.<init>(Connection.java:1409)
at com.datastax.driver.core.Connection.initAsync(Connection.java:144)
at com.datastax.driver.core.Connection$Factory.open(Connection.java:796)
at com.datastax.driver.core.ControlConnection.tryConnect(ControlConnection.java:253)
at com.datastax.driver.core.ControlConnection.reconnectInternal(ControlConnection.java:201)
at com.datastax.driver.core.ControlConnection.connect(ControlConnection.java:79)
at com.datastax.driver.core.Cluster$Manager.init(Cluster.java:1473)
at com.datastax.driver.core.Cluster.init(Cluster.java:159)
at com.datastax.driver.core.Cluster.connectAsync(Cluster.java:330)
at com.datastax.driver.core.Cluster.connectAsync(Cluster.java:305)
at com.datastax.driver.core.Cluster.connect(Cluster.java:247)
at com.datastax.driver.core.DelegatingCluster.connect(DelegatingCluster.java:71)
at com.datastax.driver.dse.DseCluster.connect(DseCluster.java:351)
如错误所述, netty库可能已丢失。
我在pom.xml中添加了netty-all,但同时也遇到了同样的错误。
Pom.xml
<dependency>
<groupId>com.datastax.cassandra</groupId>
<artifactId>dse-driver</artifactId>
<version>1.1.1-beta1</version>
</dependency>
<dependency>
<groupId>com.datastax.cassandra</groupId>
<artifactId>dse-driver</artifactId>
<version>1.1.1-beta1</version>
</dependency>
<!-- https://mvnrepository.com/artifact/io.netty/netty-all -->
<dependency>
<groupId>io.netty</groupId>
<artifactId>netty-all</artifactId>
<version>4.1.6.Final</version>
</dependency>
感谢帮助..!
Java驱动程序是针对Netty 4.0构建和测试的(有关4.1支持,请参见JAVA-1241 )。 可能有一些不兼容的情况阻止了此工作(尽管我在Netty 4.1的该路径中看到IdleStateHandler)。
如果您需要在项目中使用其他版本的Netty,则可以考虑使用驱动程序的shaded
分类器,该分类器在其自身的包结构下包括其自身捆绑的netty版本。 由于您使用的是dse驱动程序,因此您还需要从其依赖项定义中排除核心驱动程序(以后将不再那么复杂):
<dependency>
<groupId>com.datastax.cassandra</groupId>
<artifactId>cassandra-driver-core</artifactId>
<version>3.1.3</version>
<classifier>shaded</classifier>
<!-- Because the shaded JAR uses the original POM, you still need
to exclude this dependency explicitly: -->
<exclusions>
<exclusion>
<groupId>io.netty</groupId>
<artifactId>*</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>com.datastax.cassandra</groupId>
<artifactId>dse-driver</artifactId>
<version>1.1.1-beta1</version>
<exclusions>
<exclusion>
<groupId>com.datastax.cassandra</groupId>
<artifactId>cassandra-driver-core</artifactId>
</exclusion>
</exclusions>
</dependency>
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