Question

我有一项服务，负责在注册页面成功填写后创建相关的帐户层次结构：

    def userRole = Role.findByAuthority("ROLE_USER")
    final account = new Account(email: command.email, password: command.password)
    account.save(flush: true)

    final publisher = new Publisher(name: command.name) //, account: account)
    publisher.save(flush: true)

    final accountRole = AccountRole.create account, userRole

无论我做什么，AccountRole.create account, userRole都失败了：

static AccountRole create(Account account, Role role) {
    def instance = new AccountRole(account: account, role: role)
    instance.save()  // throws NullPointerException
    instance
}

我尝试了new AccountRole(account: account, role: userRole)，但是当我手动调用save时，这也失败了。 Account和AccountRole是由Grails 3 Spring Security插件生成（并略微调整）的类。

以下是失败的AccountRole.create(...)调用的堆栈跟踪：

java.lang.reflect.InvocationTargetException: null
    at grails.plugin.springsecurity.web.UpdateRequestContextHolderExceptionTranslationFilter.doFilter(UpdateRequestContextHolderExceptionTranslationFilter.groovy:64)
    at grails.plugin.springsecurity.web.filter.GrailsAnonymousAuthenticationFilter.doFilter(GrailsAnonymousAuthenticationFilter.groovy:53)
    at grails.plugin.springsecurity.web.authentication.logout.MutableLogoutFilter.doFilter(MutableLogoutFilter.groovy:62)
    at grails.plugin.springsecurity.web.SecurityRequestHolderFilter.doFilter(SecurityRequestHolderFilter.groovy:58)
    at grails.plugin.springsecurity.web.filter.DebugFilter.invokeWithWrappedRequest(DebugFilter.groovy:102)
    at grails.plugin.springsecurity.web.filter.DebugFilter.doFilter(DebugFilter.groovy:69)
    at grails.plugin.springsecurity.web.UpdateRequestContextHolderExceptionTranslationFilter.doFilter(UpdateRequestContextHolderExceptionTranslationFilter.groovy:64)
    at grails.plugin.springsecurity.web.filter.GrailsAnonymousAuthenticationFilter.doFilter(GrailsAnonymousAuthenticationFilter.groovy:53)
    at grails.plugin.springsecurity.web.authentication.logout.MutableLogoutFilter.doFilter(MutableLogoutFilter.groovy:62)
    at grails.plugin.springsecurity.web.SecurityRequestHolderFilter.doFilter(SecurityRequestHolderFilter.groovy:58)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException: null
    at package.AccountRole.create(AccountRole.groovy:48)
    at package.RegistrationService.$tt__handleNewRegistration(RegistrationService.groovy:25)

版本信息：

| Grails Version: 3.1.5
| Groovy Version: 2.4.6
| JVM Version: 1.8.0_73

请救我脱离苦难！我现在花了好几个小时:(

Answer 1

确实没有足够的信息，但instance因为您刚刚使用构造函数调用创建它而不可能为null，但您应该检查确定，例如

static AccountRole create(Account account, Role role) {
   def instance = new AccountRole(account: account, role: role)
   println "instance null? ${instance == null}"
   instance.save()  // throws NullPointerException
   instance
}

验证过程中出现问题的可能性更大，因此我的猜测是userRole或account出现了问题。检查userRole是否已正确检索，并且帐户save()调用中没有验证错误：

def account = new Account(email: command.email, password: command.password)
account.save(flush: true)
if (account.hasErrors()) {
   log.warn "Failed to save Account $account: $account.errors"
}

保存Grails GORM / Domain类会导致“NullPointerException”

1 个答案: