Question

我试图将Spring LDAP PoolingContextSource XML配置转换为使用注释。我可以按照提及here的方式使LdapContextSource工作，但我无法使PoolingContextSource工作。当我运行代码时，我得到了NullPointerException。下面列出了XML，注释和异常片段。

XML配置代码段

<ldap:context-source
        id="ldapContextSource"
        username="${ldap.username}"
        password="${ldap.password}"
        url="${ldap.url}"
        base="${ldap.base}">
    <ldap:pooling
            test-on-borrow="true"
            test-while-idle="true"/>
</ldap:context-source>

<ldap:ldap-template id="ldapTemplate" context-source-ref="ldapContextSource"/>

注释配置代码段

@Bean
public ContextSource ldapContextSource() {
    LdapContextSource contextSource = new LdapContextSource();
    contextSource.setUrl(ldapUrl);
    contextSource.setBase(ldapBase);
    contextSource.setUserDn(ldapUsername);
    contextSource.setPassword(ldapPassword);

    PoolingContextSource poolingContextSource = new PoolingContextSource();
    poolingContextSource.setDirContextValidator(new DefaultDirContextValidator());
    poolingContextSource.setContextSource(contextSource);
    poolingContextSource.setTestOnBorrow(true);
    poolingContextSource.setTestWhileIdle(true);

    TransactionAwareContextSourceProxy proxy = new TransactionAwareContextSourceProxy(poolingContextSource);

    return proxy;
}

@Bean
public LdapTemplate ldapTemplate() {
    return new LdapTemplate(ldapContextSource());
}

我得到了例外，

Exception in thread "main" org.springframework.dao.DataAccessResourceFailureException: Failed to borrow DirContext from pool.; nested exception is java.lang.NullPointerException
at org.springframework.ldap.pool.factory.PoolingContextSource.getContext(PoolingContextSource.java:446)
at org.springframework.ldap.pool.factory.PoolingContextSource.getReadWriteContext(PoolingContextSource.java:429)
at org.springframework.ldap.transaction.compensating.manager.TransactionAwareContextSourceProxy.getReadWriteContext(TransactionAwareContextSourceProxy.java:88)
at org.springframework.ldap.transaction.compensating.manager.TransactionAwareContextSourceProxy.getReadOnlyContext(TransactionAwareContextSourceProxy.java:61)
at org.springframework.ldap.core.LdapTemplate.search(LdapTemplate.java:357)
at org.springframework.ldap.core.LdapTemplate.search(LdapTemplate.java:309)
at org.springframework.ldap.core.LdapTemplate.search(LdapTemplate.java:642)
at org.springframework.ldap.core.LdapTemplate.search(LdapTemplate.java:578)
at org.springframework.ldap.core.LdapTemplate.find(LdapTemplate.java:1836)
at org.springframework.ldap.core.LdapTemplate.find(LdapTemplate.java:1857)
at org.springframework.ldap.core.LdapTemplate.findOne(LdapTemplate.java:1865)
at org.example.playground.ldap.spring.PersonDaoImpl.getByAccountId(PersonDaoImpl.java:23)
at org.example.playground.ldap.spring.Main.main(Main.java:19)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:140)

Caused by: java.lang.NullPointerException
at org.springframework.ldap.core.support.AbstractContextSource.getReadWriteContext(AbstractContextSource.java:175)
at org.springframework.ldap.pool.factory.DirContextPoolableObjectFactory.makeObject(DirContextPoolableObjectFactory.java:149)
at org.apache.commons.pool.impl.GenericKeyedObjectPool.borrowObject(GenericKeyedObjectPool.java:1220)
at org.springframework.ldap.pool.factory.PoolingContextSource.getContext(PoolingContextSource.java:443)
... 17 more

Answer 1

解决方案1  - 基于here

的回答

@Bean
public ContextSource ldapContextSource() {
    LdapContextSource contextSource = new LdapContextSource();
    contextSource.setUrl(ldapUrl);
    contextSource.setBase(ldapBase);
    contextSource.setUserDn(ldapUsername);
    contextSource.setPassword(ldapPassword);
    contextSource.afterPropertiesSet(); // *** need this ***

    PoolingContextSource poolingContextSource = new PoolingContextSource();
    poolingContextSource.setDirContextValidator(new DefaultDirContextValidator());
    poolingContextSource.setContextSource(contextSource);
    poolingContextSource.setTestOnBorrow(true);
    poolingContextSource.setTestWhileIdle(true);

    TransactionAwareContextSourceProxy proxy = new TransactionAwareContextSourceProxy(poolingContextSource);

    return proxy;
}

解决方案2 - 分离LdapContextSource和PoolingContextSource的创建，spring容器将关注bean的生命周期（即afterPropertiesSet（））

@Bean
public LdapContextSource ldapContextSource() {
    LdapContextSource contextSource = new LdapContextSource();
    contextSource.setUrl(ldapUrl);
    contextSource.setBase(ldapBase);
    contextSource.setUserDn(ldapUsername);
    contextSource.setPassword(ldapPassword);
    return contextSource;
}

@Bean
public ContextSource poolingLdapContextSource() {
    PoolingContextSource poolingContextSource = new PoolingContextSource();
    poolingContextSource.setDirContextValidator(new DefaultDirContextValidator());
    poolingContextSource.setContextSource(ldapContextSource());
    poolingContextSource.setTestOnBorrow(true);
    poolingContextSource.setTestWhileIdle(true);

    TransactionAwareContextSourceProxy proxy = new TransactionAwareContextSourceProxy(poolingContextSource);
    return proxy;
}

Answer 2

可以使用以下代码来激活a中的池（https://docs.spring.io/spring-ldap/docs/1.3.2.RELEASE/reference/html/pooling.html）

SpringBoot应用程序
使用Spring Data与Ldap服务器对话

在那里缺少的重要部分-是将PoolingContextSource传递到LdapTemplate

请参见

中的new LdapTemplate(poolingLdapContextSource());

@PropertySource("ldap-${spring.profiles.active}.properties")
@Configuration
public class LdapConfiguration {

  private static Logger LOG = LoggerFactory.getLogger(LdapConfiguration.class);

  @Autowired
  private Environment env;


  @Bean
  public LdapContextSource contextSource() {
    LdapContextSource contextSource = new LdapContextSource();
    contextSource.setUrl(env.getRequiredProperty("ldap.url"));
    contextSource.setBase(env.getRequiredProperty("ldap.base"));
    contextSource.setUserDn(env.getRequiredProperty("ldap.user"));
    contextSource.setPassword(env.getRequiredProperty("ldap.password"));
    contextSource.setPooled(false); // Robert improved the performance by 100x for PARALLEL requests by enabling that

    Map<String, Object> environment = new HashMap<>();

    // DEBUGGING
    environment.put("com.sun.jndi.ldap.connect.pool.debug", "fine");    // many debug infos
    contextSource.setBaseEnvironmentProperties(environment);

    return contextSource;
  }

    /**
     * Configure the LDAP connection pool to
     * validate connections https://docs.spring.io/spring-ldap/docs/1.3.2.RELEASE/reference/html/pooling.html
     *
     * so that the connections do not expire in pool
     *
     * @return
     */
    @Bean
    public ContextSource poolingLdapContextSource() {
        PoolingContextSource poolingContextSource = new PoolingContextSource();
        poolingContextSource.setDirContextValidator(new DefaultDirContextValidator());
        poolingContextSource.setContextSource(contextSource());
        poolingContextSource.setTestOnBorrow(true);
        poolingContextSource.setTestWhileIdle(true);
        poolingContextSource.setTimeBetweenEvictionRunsMillis(60000);
        poolingContextSource.setNumTestsPerEvictionRun(3);

        TransactionAwareContextSourceProxy proxy = new TransactionAwareContextSourceProxy(poolingContextSource);
        return proxy;
    }

  @Bean
  public LdapTemplate ldapTemplate() {
    LdapTemplate ldapTemplate = new LdapTemplate(poolingLdapContextSource());
    ldapTemplate.setIgnoreNameNotFoundException(true);
    return ldapTemplate;
  }

}

通过注释Spring LDAP PoolingContextSource

2 个答案: