Question

我是Spring Boot的新手。我正在使用spring boot 1.5.1，springSecurityVersion 3.2.3和org.thymeleaf.extras:thymeleaf-extras-springsecurity4版本，但是却遇到了异常

java.lang.ClassNotFoundException: org.springframework.security.core.context.SecurityContextHolder
at java.net.URLClassLoader.findClass(URLClassLoader.java:381) ~[na:1.8.0_121]
at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[na:1.8.0_121]
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331) ~[na:1.8.0_121]
at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[na:1.8.0_121]
at org.thymeleaf.extras.springsecurity4.auth.AuthUtils.getAuthenticationObject(AuthUtils.java:95) ~[thymeleaf-extras-springsecurity4-2.1.2.RELEASE.jar:2.1.2.RELEASE]
at org.thymeleaf.extras.springsecurity4.dialect.SpringSecurityDialect.getAdditionalExpressionObjects(SpringSecurityDialect.java:117) ~[thymeleaf-extras-springsecurity4-2.1.2.RELEASE.jar:2.1.2.RELEASE]
at org.thymeleaf.context.AbstractDialectAwareProcessingContext.computeExpressionObjects(AbstractDialectAwareProcessingContext.java:113) ~[thymeleaf-2.1.4.RELEASE.jar:2.1.4.RELEASE]
at org.thymeleaf.context.AbstractProcessingContext.getExpressionObjects(AbstractProcessingContext.java:132) ~[thymeleaf-2.1.4.RELEASE.jar:2.1.4.RELEASE]
at org.thymeleaf.spring4.expression.SpelVariableExpressionEvaluator.computeExpressionObjects(SpelVariableExpressionEvaluator.java:197) ~[thymeleaf-spring4-2.1.4.RELEASE.jar:2.1.4.RELEASE]
at org.thymeleaf.spring4.expression.SpelVariableExpressionEvaluator.evaluate(SpelVariableExpressionEvaluator.java:115) ~[thymeleaf-spring4-2.1.4.RELEASE.jar:2.1.4.RELEASE]
at org.thymeleaf.standard.expression.VariableExpression.executeVariable(VariableExpression.java:154) ~[thymeleaf-2.1.4.RELEASE.jar:2.1.4.RELEASE]
at org.thymeleaf.standard.expression.SimpleExpression.executeSimple(SimpleExpression.java:59) ~[thymeleaf-2.1.4.RELEASE.jar:2.1.4.RELEASE

我的配置有什么错误？

Answer 1

如问题中所述，您正在使用Spring Security 3.2.3，但也使用thymeleaf-extras-springsecurity4依赖项，该依赖项仅适用于Spring Security 4.x。

由于这种不兼容，Thymeleaf依赖项无法找到某些类，这就是为什么它抛出ClassNotFoundException的原因。

解决方案是使用以下任一兼容的库：

将Spring Security版本升级到 v4.x 。通常，默认情况下，Spring Boot 1.3及更高版本带有Spring Security4.x。因此，从理论上讲，除非您的某个地方存在依赖性冲突，否则您应该能够使用Spring Security 4。如果没有手动执行此操作，请检查依赖关系树的根本原因，以了解为什么使用Spring Security 3.2.3。

将Thymeleaf依赖项降级为thymeleaf-extras-springsecurity3，例如，在使用Maven时：

<dependency>
    <groupId>org.thymeleaf.extras</groupId>
    <artifactId>thymeleaf-extras-springsecurity3</artifactId>
</dependency>

如何解决java.lang.ClassNotFoundException：org.springframework.security.core.context.SecurityContextHolder

1 个答案: