Missing class org.springframework.objenesis.ObjenesisStd

今天spring整合mongo

在调试过程中发现以下问题：

Caused by: org.springframework.beans.BeanInstantiationException: Could
not instantiate bean class
[org.springframework.data.mongodb.core.MongoTemplate]: Constructor
threw exception; nested exception is java.lang.NoClassDefFoundError:
org/springframework/objenesis/ObjenesisStd at
org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:163) at
org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:121) at
org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:280)
... 51 more Caused by: java.lang.NoClassDefFoundError:
org/springframework/objenesis/ObjenesisStd at
org.springframework.data.mongodb.core.convert.DefaultDbRefResolver.<init>(DefaultDbRefResolver.java:72) at
org.springframework.data.mongodb.core.MongoTemplate.getDefaultMongoConverter(MongoTemplate.java:1961) at
org.springframework.data.mongodb.core.MongoTemplate.<init>(MongoTemplate.java:210) at
org.springframework.data.mongodb.core.MongoTemplate.<init>(MongoTemplate.java:174) at
sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39) at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27) at
java.lang.reflect.Constructor.newInstance(Constructor.java:513) at
org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:148)
... 53 more Caused by: java.lang.ClassNotFoundException:
org.springframework.objenesis.ObjenesisStd at
java.net.URLClassLoader$1.run(URLClassLoader.java:202) at
java.security.AccessController.doPrivileged(Native Method) at
java.net.URLClassLoader.findClass(URLClassLoader.java:190) at
java.lang.ClassLoader.loadClass(ClassLoader.java:306) at
sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) at
java.lang.ClassLoader.loadClass(ClassLoader.java:247)

我的配置文件：

<bean id="userCredentials" class="org.springframework.data.authentication.UserCredentials">

<constructor-arg name="username" value="${mongo.username}"/>

<constructor-arg name="password" value="${mongo.password}"/>

</bean>

<mongo:mongo id="mongo" replica-set="127.0.0.1:27017">

<!-- 一些连接属性的设置 -->

<mongo:options

connections-per-host="8"

threads-allowed-to-block-for-connection-multiplier="3"

connect-timeout="10000"

max-wait-time="20000"

auto-connect-retry="true"

socket-keep-alive="true"

socket-timeout="1500"

write-number="1"

write-timeout="0"

write-fsync="true"/>

</mongo:mongo>

<mongo:db-factory dbname="database" mongo-ref="mongo" />

<bean id="mongoTemplate" class="org.springframework.data.mongodb.core.MongoTemplate">

<constructor-arg ref="mongo" />

<constructor-arg name="databaseName" value="mytest" />

</bean>

测试代码：

public void testQueryTest() {

context = new ClassPathXmlApplicationContext("spring/spring-datasource-mogon-1.xml");

mongoTemplate = (MongoTemplate) context.getBean("mongoTemplate");

DBCollection coll = mongoTemplate.getCollection("test");

System.out.println("Collection mycol selected successfully");

DBCursor cursor = coll.find();

int i=1;

while (cursor.hasNext()) {

System.out.println("Inserted Document: "+i);

System.out.println(cursor.next());

i++;

}

}

经过查询发现后，发现我引用的spring-data-mongodb的jar包的版本是1.6.2的、mongo.1.9.2.jar，spring-data-mongodb.1.6以上的版本需要配置的spring的版本需要4.0以上(http://stackoverflow.com/questions/25262248/missing-class-org-springframework-objenesis-objenesisstd)。我的spring的版本是2.3的。

由于spring改动后，整个项目改动比较大，影响比较大，所以选择修改spring-data-mongodb的版本，后期将版本降级为1.5.2，后启动并运行。问题解决。