Weblogic 12c 上的 Spring-boot 之战

Question

在 WebLogic 12.2.1.2.0 上使用 Spring-boot 2.1.2.RELEASE 进行部署时出现错误。

这是堆栈跟踪：

Caused By: java.lang.IllegalAccessError: tried to access method com.fasterxml.jackson.databind.ser.std.StdSerializer.<init>(Ljava/lang/Class;)V from class com.fasterxml.jackson.datatype.jsr310.JavaTimeModule

at com.fasterxml.jackson.datatype.jsr310.JavaTimeModule.<init>(JavaTimeModule.java:168)

at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)

at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)

at java.lang.reflect.Constructor.newInstance(Constructor.java:423)

at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:172)

at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:122)

at org.springframework.http.converter.json.Jackson2ObjectMapperBuilder.registerWellKnownModulesIfAvailable(Jackson2ObjectMapperBuilder.java:760)

at org.springframework.http.converter.json.Jackson2ObjectMapperBuilder.configure(Jackson2ObjectMapperBuilder.java:639)

at org.springframework.http.converter.json.Jackson2ObjectMapperBuilder.build(Jackson2ObjectMapperBuilder.java:623)

at org.springframework.http.converter.json.MappingJackson2HttpMessageConverter.<init>(MappingJackson2HttpMessageConverter.java:59)

at org.springframework.http.converter.support.AllEncompassingFormHttpMessageConverter.<init>(AllEncompassingFormHttpMessageConverter.java:76)

at org.springframework.web.filter.FormContentFilter.<init>(FormContentFilter.java:60)

at org.springframework.boot.web.servlet.filter.OrderedFormContentFilter.<init>(OrderedFormContentFilter.java:29)

at org.springframework.boot.autoconfigure.web.servlet.WebMvcAutoConfiguration.formContentFilter(WebMvcAutoConfiguration.java:166)

我也尝试过使用 prefer-web-inf 类。StdSerializer 类在 jackson-datatype-jsr310:2.9.8 jar 中，理论上这不应该是一个问题，因为 welogic 没有包含 Jackson。任何帮助，将不胜感激。

Answer 1

1) 在 weblogic.xml 文件中只保留这些包，其他包是不必要的：<wls:prefer-application-packages>&nbsp; &nbsp; <wls:package-name>org.slf4j.*</wls:package-name>&nbsp; &nbsp; <wls:package-name>org.springframeworks.*</wls:package-name>&nbsp; &nbsp; <wls:package-name>com.fasterxml.jackson.*</wls:package-name></wls:prefer-application-packages>2）根据Spring Docs第 92.1 节将其包含在您的 pom.xml 中：<dependency>&nbsp; &nbsp; <groupId>org.springframework.boot</groupId>&nbsp; &nbsp; <artifactId>spring-boot-starter-tomcat</artifactId>&nbsp; &nbsp; <scope>provided</scope></dependency>发生此错误是因为 Spring Boot 正在尝试启动 Tomcat 容器，导致类路径冲突。按照提供的方式设置依赖项将删除其中的大部分，并在 weblogic.xml 中包含 com.fasterxml.jackson.* 将处理剩余的冲突。