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初学Redis时常见的异常：Cannot get Jedis connection
org.springframework.data.redis.RedisConnectionFailureException: Cannot get Jedis connection; nested exception is redis.clients.jedis.exceptions.JedisConnectionException: Could not get a resource from the pool
at org.springframework.data.redis.connection.jedis.JedisConnectionFactory.fetchJedisConnector(JedisConnectionFactory.java:140)
at org.springframework.data.redis.connection.jedis.JedisConnectionFactory.getConnection(JedisConnectionFactory.java:229)
at org.springframework.data.redis.connection.jedis.JedisConnectionFactory.getConnection(JedisConnectionFactory.java:57)
at org.springframework.data.redis.core.RedisConnectionUtils.doGetConnection(RedisConnectionUtils.java:128)
at org.springframework.data.redis.core.RedisConnectionUtils.getConnection(RedisConnectionUtils.java:91)
at org.springframework.data.redis.core.RedisConnectionUtils.getConnection(RedisConnectionUtils.java:78)
at org.springframework.data.redis.core.RedisTemplate.execute(RedisTemplate.java:177)
at org.springframework.data.redis.core.RedisTemplate.execute(RedisTemplate.java:152)
at org.springframework.data.redis.core.AbstractOperations.execute(AbstractOperations.java:85)
at org.springframework.data.redis.core.DefaultValueOperations.set(DefaultValueOperations.java:169)
at com.sunhui.redis.test.RedisDemo.redisDemo(RedisDemo.java:18)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:389)
at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:115)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeTestMethod$6(TestMethodTestDescriptor.java:167)
at org.junit.jupiter.engine.execution.ThrowableCollector.execute(ThrowableCollector.java:40)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeTestMethod(TestMethodTestDescriptor.java:163)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:110)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:57)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda$execute$3(HierarchicalTestExecutor.java:83)
at org.junit.platform.engine.support.hierarchical.SingleTestExecutor.executeSafely(SingleTestExecutor.java:66)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:77)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda$null$2(HierarchicalTestExecutor.java:92)
at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184)
at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175)
at java.util.Iterator.forEachRemaining(Iterator.java:116)
at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151)
at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174)
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:418)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda$execute$3(HierarchicalTestExecutor.java:92)
at org.junit.platform.engine.support.hierarchical.SingleTestExecutor.executeSafely(SingleTestExecutor.java:66)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:77)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda$null$2(HierarchicalTestExecutor.java:92)
at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184)
at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175)
at java.util.Iterator.forEachRemaining(Iterator.java:116)
at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151)
at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174)
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:418)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda$execute$3(HierarchicalTestExecutor.java:92)
at org.junit.platform.engine.support.hierarchical.SingleTestExecutor.executeSafely(SingleTestExecutor.java:66)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:77)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:51)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:43)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:170)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:154)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:90)
at org.eclipse.jdt.internal.junit5.runner.JUnit5TestReference.run(JUnit5TestReference.java:86)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:538)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:760)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:460)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:206)
Caused by: redis.clients.jedis.exceptions.JedisConnectionException: Could not get a resource from the pool
at redis.clients.util.Pool.getResource(Pool.java:42)
at org.springframework.data.redis.connection.jedis.JedisConnectionFactory.fetchJedisConnector(JedisConnectionFactory.java:133)
... 63 more
Caused by: redis.clients.jedis.exceptions.JedisConnectionException: java.net.ConnectException: Connection refused: connect
at redis.clients.jedis.Connection.connect(Connection.java:142)
at redis.clients.jedis.BinaryClient.connect(BinaryClient.java:75)
at redis.clients.jedis.BinaryJedis.connect(BinaryJedis.java:1724)
at redis.clients.jedis.JedisFactory.makeObject(JedisFactory.java:65)
at org.apache.commons.pool2.impl.GenericObjectPool.create(GenericObjectPool.java:836)
at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:434)
at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:361)
at redis.clients.util.Pool.getResource(Pool.java:40)
... 64 more
Caused by: java.net.ConnectException: Connection refused: connect
at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method)
at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:85)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at redis.clients.jedis.Connection.connect(Connection.java:137)
... 71 more原因及解决方法如下：
一、原因：Redis没有启动
以Windows系统为例：点击startup.cmd
出现上图界面，说明redis启动成功！
二、原因：防火墙没有关闭
控制面板--->Windows防火墙--->打开或关闭Windows防火墙--->关闭即可
三、原因：客户端去redis服务器拿连接时，连接池中无可用连接
调整JedisPoolConfig中maxActive的值
<!-- 使用Spring配置JedisPoolConfig对象 -->
<bean id="poolConfig" class="redis.clients.jedis.JedisPoolConfig">
<!-- 最大空闲数 -->
<property name="maxIdle" value="300" />
<!-- 最大连接数 -->
<property name="maxTotal" value="100" />
<!-- 最大等待时间 -->
<property name="maxWaitMillis" value="20000" />
</bean><!-- 使用Spring配置JedisPoolConfig对象 -->
<bean id="poolConfig" class="redis.clients.jedis.JedisPoolConfig">
<!-- 最大空闲数 -->
<property name="maxIdle" value="300" />
<!-- 最大连接数 -->
<property name="maxTotal" value="100" />
<!-- 最大等待时间 -->
<property name="maxWaitMillis" value="20000" />
</bean>话不多说，上完整代码（applicationContext.xml）：
<?xml version="1.0" encoding="UTF-8"?><!-- 当前的XML文档版本与字符编码 -->
<!-- xmlns：自定义标记及XML编写规范的命名空间。 -->
<!-- xmlns:xsi：指当前XML文档应遵守的W3C国际组织定义的XML编写规范 -->
<!-- xsi:schemaLocation： 指定某命名空间所使用的schema约束文件路径。 -->
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd">
<!-- 使用Spring配置JedisPoolConfig对象 -->
<bean id="poolConfig" class="redis.clients.jedis.JedisPoolConfig">
<!-- 最大空闲数 -->
<property name="maxIdle" value="300" />
<!-- 最大连接数 -->
<property name="maxTotal" value="100" />
<!-- 最大等待时间 -->
<property name="maxWaitMillis" value="20000" />
</bean>
<!-- 配置JedisConnectionFactory -->
<bean id="connectionFactory" class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory">
<!-- hostName:服务器 默认值是localhost -->
<property name="hostName" value="localhost" />
<!-- Port：端口号 默认值是6379 -->
<property name="port" value="6379" />
<!-- password:连接redis时所需要的密码 -->
<!-- <property name="password" value="password" /> -->
<!-- poolConfig:连接池配置对象 -->
<property name="poolConfig" ref="poolConfig" />
</bean>
<!-- 配置SpringRedisTemplate -->
<bean id="jdkSerializationRedisSerializer"
class="org.springframework.data.redis.serializer.JdkSerializationRedisSerializer">
</bean>
<bean id="stringRedisSerializer"
class="org.springframework.data.redis.serializer.StringRedisSerializer">
</bean>
<bean id="redisTemplate" class="org.springframework.data.redis.core.RedisTemplate">
<property name="connectionFactory" ref="connectionFactory" />
<property name="keySerializer" ref="stringRedisSerializer" />
<property name="valueSerializer" ref="jdkSerializationRedisSerializer" />
</bean>
</beans><property name="maxIdle" value="300" />
<!-- 最大连接数 -->
<property name="maxTotal" value="100" />
<!-- 最大等待时间 -->
<property name="maxWaitMillis" value="20000" />
</bean>
<!-- 配置JedisConnectionFactory -->
<bean id="connectionFactory" class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory">
<!-- hostName:服务器 默认值是localhost -->
<property name="hostName" value="localhost" />
<!-- Port：端口号 默认值是6379 -->
<property name="port" value="6379" />
<!-- password:连接redis时所需要的密码 -->
<!-- <property name="password" value="password" /> -->
<!-- poolConfig:连接池配置对象 -->
<property name="poolConfig" ref="poolConfig" />
</bean>
<!-- 配置SpringRedisTemplate -->
<bean id="jdkSerializationRedisSerializer"
class="org.springframework.data.redis.serializer.JdkSerializationRedisSerializer">
</bean>
<bean id="stringRedisSerializer"
class="org.springframework.data.redis.serializer.StringRedisSerializer">
</bean>
<bean id="redisTemplate" class="org.springframework.data.redis.core.RedisTemplate">
<property name="connectionFactory" ref="connectionFactory" />
<property name="keySerializer" ref="stringRedisSerializer" />
<property name="valueSerializer" ref="jdkSerializationRedisSerializer" />
</bean>
</beans>