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Spring Boot异常整理

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这里是一个Spring Boot的示例，里面包含了一些JPA、C3P0连接池、AOP、拦截器、Freemarker、缓存的配置。
地址：https://gitee.com/acgist/demo/tree/master/springboot

后面是一些遇到的错误整理。

Spring Boot和Java9，启动时出现以下错误：

Caused by: java.lang.NoClassDefFoundError: javax/xml/bind/JAXBException

这个是因为Java9模块化，所以以前JavaEE的一些包放到了java.se.ee模块，默认导入模块java.se是不包含以前的一些功能了。
所以需要启动参数添加--add-modules java.xml.bind或者修改JDK为9以前的版本。
添加参数如图：

Eclipse添加JVM启动参数

也可以配置--add-modules=java.xml.bind也可以，中间的等号可有可无，如果多个模块中间用逗号分隔

--add-modules jdk.incubator.httpclient,java.xml.bind
--add-modules=jdk.incubator.httpclient,java.xml.bind

如果实在Tomcat中使用，需要在启动脚本中添加：

set "JDK_JAVA_OPTIONS=%JDK_JAVA_OPTIONS% --add-modules java.xml.bind"

添加位置如图：

Tomcat启动参数

org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.acgist.dao.UserRepository' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
Description:
Field userRepository in com.acgist.service.UserService required a bean of type 'com.acgist.dao.UserRepository' that could not be found.
Action:
Consider defining a bean of type 'com.acgist.dao.UserRepository' in your configuration.

Repository接口注入失败，查看日志发现：

Ignored because not a concrete top-level class: file [E:\git\spring\springboot\target\classes\com\acgist\dao\UserRepository.class]

添加注解@EnableJpaRepositories("com.acgist.dao")，不然会忽略没有实现的接口。

Caused by: java.lang.IllegalArgumentException: Not a managed type: class com.acgist.entity.UserEntity
	at org.hibernate.metamodel.internal.MetamodelImpl.managedType(MetamodelImpl.java:472)

添加实体包扫描注解@EntityScan("com.acgist.entity")

[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.7.0:compile (default-compile) on project acgist_gx: Compilation failure: Compilation failure:
[ERROR] /E:/GITEE/acgist_gx/src/main/java/com/acgist/modules/http/HTTPTools.java:[13,21] 程序包 jdk.incubator.http 不可见
[ERROR] (程序包 jdk.incubator.http 已在模块 jdk.incubator.httpclient 中声明, 但该模块不在模块图中)
[ERROR] /E:/GITEE/acgist_gx/src/main/java/com/acgist/modules/http/HTTPTools.java:[14,21] 程序包 jdk.incubator.http 不可见
[ERROR] (程序包 jdk.incubator.http 已在模块 jdk.incubator.httpclient 中声明, 但该模块不在模块图中)
[ERROR] /E:/GITEE/acgist_gx/src/main/java/com/acgist/modules/http/HTTPTools.java:[15,38] 程序包jdk.incubator.http.HttpRequest不存在
[ERROR] /E:/GITEE/acgist_gx/src/main/java/com/acgist/modules/http/HTTPTools.java:[16,38] 程序包jdk.incubator.http.HttpRequest不存在
[ERROR] /E:/GITEE/acgist_gx/src/main/java/com/acgist/modules/http/HTTPTools.java:[17,21] 程序包 jdk.incubator.http 不可见
[ERROR] (程序包 jdk.incubator.http 已在模块 jdk.incubator.httpclient 中声明, 但该模块不在模块图中)
[ERROR] /E:/GITEE/acgist_gx/src/main/java/com/acgist/modules/http/HTTPTools.java:[59,17] 找不到符号
[ERROR] 符号:   类 Builder
[ERROR] 位置: 类 com.acgist.modules.http.HTTPTools
[ERROR] /E:/GITEE/acgist_gx/src/main/java/com/acgist/modules/http/HTTPTools.java:[69,17] 找不到符号
[ERROR] 符号:   类 BodyPublisher
[ERROR] 位置: 类 com.acgist.modules.http.HTTPTools
[ERROR] /E:/GITEE/acgist_gx/src/main/java/com/acgist/modules/http/HTTPTools.java:[41,17] 找不到符号
[ERROR] 符号:   类 Builder
[ERROR] 位置: 类 com.acgist.modules.http.HTTPTools
[ERROR] /E:/GITEE/acgist_gx/src/main/java/com/acgist/modules/http/HTTPTools.java:[54,17] 找不到符号
[ERROR] 符号:   类 Builder
[ERROR] 位置: 类 com.acgist.modules.http.HTTPTools
[ERROR] /E:/GITEE/acgist_gx/src/main/java/com/acgist/modules/http/HTTPTools.java:[60,17] 找不到符号
[ERROR] 符号:   类 Builder
[ERROR] 位置: 类 com.acgist.modules.http.HTTPTools
[ERROR] -> [Help 1]
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.

Maven打包时提示上面的错误，和上面的一样需要添加模块jdk.incubator.httpclient，添加下面代码到pom.xml：

<plugin>
	<artifactId>maven-compiler-plugin</artifactId>
	<configuration>
		<compilerArgs>
			<arg>--add-modules</arg>
			<arg>jdk.incubator.httpclient</arg>
		</compilerArgs>
	</configuration>
</plugin>

运行时提示：

org.springframework.web.util.NestedServletException: Handler dispatch failed; nested exception is java.lang.NoClassDefFoundError: jdk/incubator/http/HttpRequest

需要需要添加参数：

java -jar --add-modules jdk.incubator.httpclient app.jar

单元测试找不到配置错误提示：

Caused by: java.io.FileNotFoundException: Could not open ServletContext resource [/email.properties]
	at org.springframework.web.context.support.ServletContextResource.getInputStream(ServletContextResource.java:159)
	at org.springframework.core.io.support.EncodedResource.getInputStream(EncodedResource.java:159)
	at org.springframework.core.io.support.PropertiesLoaderUtils.fillProperties(PropertiesLoaderUtils.java:99)
	at org.springframework.core.io.support.PropertiesLoaderUtils.fillProperties(PropertiesLoaderUtils.java:73)

配置@PropertySource(value = "/email.properties")改为@PropertySource(value = "classpath:/email.properties")

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