06-May-2020 14:16:22.442 警告 [RMI TCP Connection(3)-127.0.0.1] org.springframework.web.context.support.XmlWebApplicationContext.refresh Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mappingJackson2HttpMessageConverter': Lookup method resolution failed; nested exception is java.lang.IllegalStateException: Failed to introspect Class [org.springframework.http.converter.json.MappingJackson2HttpMessageConverter] from ClassLoader [ParallelWebappClassLoader
context: StudentSystemSSMDemo_war_exploded
delegate: false
----------> Parent Classloader:
java.net.URLClassLoader@379619aa
]
06-May-2020 14:16:22.443 嚴重 [RMI TCP Connection(3)-127.0.0.1] org.springframework.web.servlet.DispatcherServlet.initServletBean Context initialization failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mappingJackson2HttpMessageConverter': Lookup method resolution failed; nested exception is java.lang.IllegalStateException: Failed to introspect Class [org.springframework.http.converter.json.MappingJackson2HttpMessageConverter] from ClassLoader [ParallelWebappClassLoader
context: StudentSystemSSMDemo_war_exploded
delegate: false
----------> Parent Classloader:
java.net.URLClassLoader@379619aa
]
uj5u.com熱心網友回復：
貼下代碼呀看報錯資訊應該是沒有初始化bean，所以獲取不到。使用的話需要new，不能用@Autowire
MappingJackson2HttpMessageConverter mappingJackson2HttpMessageConverter = new MappingJackson2HttpMessageConverter();
uj5u.com熱心網友回復：
用的是springMVC組態檔
uj5u.com熱心網友回復：
<bean id="mappingJackson2HttpMessageConverter" class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
<property name="supportedMediaTypes">
<list>
<!-- 設定相應支持型別 -->
<value>text/html;charset=UTF-8</value>
<!-- 設定body支持型別 -->
<value>application/x-www-form-urlencoded</value>
<value>application/jason;charset=UTF-8</value>
</list>
</property>
</bean>
<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
<property name="messageConverters">
<list>
<ref bean="mappingJackson2HttpMessageConverter" />
</list>
</property>
</bean>
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