java - 无法定义以 keycloak 开头的属性

Question

无法定义以 keycloak 开头的属性。如果 keycloak-spring-boot-starter starter jar 观察到 jar 不知道的 keycloak 属性，则它无法加载属性。如果我们在属性前添加“sso”前缀，问题就解决了，有没有办法在保留keycloak前缀的情况下避免这个错误。

keycloak.admin.username=
keycloak.admin.password=

sso.keycloak.admin.username=
sso.keycloak.admin.password=

这是在 Spring Boot 2.5.0 and Keycloak 13.0.0 中看到的错误

Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [javax.servlet.Filter]: Factory method 'springSecurityFilterChain' threw exception; nested exception is java.lang.NullPointerException
        at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185)
        at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:653)
        ... 21 more
Caused by: java.lang.NullPointerException
        at org.springframework.security.config.annotation.web.builders.HttpSecurity.addFilterAtOffsetOf(HttpSecurity.java:2654)
        at org.springframework.security.config.annotation.web.builders.HttpSecurity.addFilterAfter(HttpSecurity.java:2645)
        at org.keycloak.adapters.springsecurity.config.KeycloakWebSecurityConfigurerAdapter.configure(KeycloakWebSecurityConfigurerAdapter.java:123)
        at com.foo.config.KeycloakSecurityConfig.configure(KeycloakSecurityConfig.java:36)
        at org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter.getHttp(WebSecurityConfigurerAdapter.java:217)
        at org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter.init(WebSecurityConfigurerAdapter.java:315)
        at org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter.init(WebSecurityConfigurerAdapter.java:93)
        at com.foo.config.KeycloakSecurityConfig$$EnhancerBySpringCGLIB$$501f46fb.init(<generated>)
        at org.springframework.security.config.annotation.AbstractConfiguredSecurityBuilder.init(AbstractConfiguredSecurityBuilder.java:338)
        at org.springframework.security.config.annotation.AbstractConfiguredSecurityBuilder.doBuild(AbstractConfiguredSecurityBuilder.java:300)
        at org.springframework.security.config.annotation.AbstractSecurityBuilder.build(AbstractSecurityBuilder.java:38)
        at org.springframework.security.config.annotation.web.configuration.WebSecurityConfiguration.springSecurityFilterChain(WebSecurityConfiguration.java:127)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:564)
        at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154)

Answer 1

此错误是在版本 中引入的Spring Security 5.5.0 随附 Spring Boot 2.5.0 .
发生这种情况是因为 KeyCloak 依次添加了两个过滤器，如下所示:

@Override
protected void configure(HttpSecurity http) throws Exception {
        http
                ...
                .addFilterAfter(keycloakSecurityContextRequestFilter(), SecurityContextHolderAwareRequestFilter.class)
                .addFilterAfter(keycloakAuthenticatedActionsRequestFilter(), KeycloakSecurityContextRequestFilter.class)
                ...
}

现在有一个错误，其中自定义过滤器顺序没有被持久化，从而导致 NullPointerException尝试添加相对于最近添加的另一个自定义过滤器的过滤器时。
我建议你现在做的是使用较低版本的 Spring Boot，比如 2.4.x，直到 issue in GitHub得到解决。