NullPointerException when setUserDn is not set

[philwebb]

This issue was originally raised with Spring Boot but I think it might an LDAP issue.

If the userDn is left unset on the ContextSource the following is logged:

Property 'userDn' not set - anonymous context will be used for read-write operations

However, later the following NPE is thrown:

java.lang.NullPointerException: null
	at java.util.Hashtable.put(Hashtable.java:460) ~[na:1.8.0_152]
	at org.springframework.ldap.core.support.SimpleDirContextAuthenticationStrategy.setupEnvironment(SimpleDirContextAuthenticationStrategy.java:42) ~[spring-ldap-core-2.3.2.RELEASE.jar:2.3.2.RELEASE]
	at org.springframework.ldap.core.support.AbstractContextSource.setupAuthenticatedEnvironment(AbstractContextSource.java:194) ~[spring-ldap-core-2.3.2.RELEASE.jar:2.3.2.RELEASE]
	at org.springframework.ldap.core.support.AbstractContextSource.getAuthenticatedEnv(AbstractContextSource.java:582) ~[spring-ldap-core-2.3.2.RELEASE.jar:2.3.2.RELEASE]
	at org.springframework.ldap.core.support.AbstractContextSource.doGetContext(AbstractContextSource.java:134) ~[spring-ldap-core-2.3.2.RELEASE.jar:2.3.2.RELEASE]
	at org.springframework.ldap.core.support.AbstractContextSource.getReadOnlyContext(AbstractContextSource.java:158) ~[spring-ldap-core-2.3.2.RELEASE.jar:2.3.2.RELEASE]
	at org.springframework.ldap.core.LdapTemplate.search(LdapTemplate.java:357) ~[spring-ldap-core-2.3.2.RELEASE.jar:2.3.2.RELEASE]
	at org.springframework.ldap.core.LdapTemplate.search(LdapTemplate.java:309) ~[spring-ldap-core-2.3.2.RELEASE.jar:2.3.2.RELEASE]
	at org.springframework.ldap.core.LdapTemplate.search(LdapTemplate.java:642) ~[spring-ldap-core-2.3.2.RELEASE.jar:2.3.2.RELEASE]
	at org.springframework.ldap.core.LdapTemplate.search(LdapTemplate.java:578) ~[spring-ldap-core-2.3.2.RELEASE.jar:2.3.2.RELEASE]
	at org.springframework.ldap.core.LdapTemplate.find(LdapTemplate.java:1840) ~[spring-ldap-core-2.3.2.RELEASE.jar:2.3.2.RELEASE]
	at org.springframework.ldap.core.LdapTemplate.find(LdapTemplate.java:1861) ~[spring-ldap-core-2.3.2.RELEASE.jar:2.3.2.RELEASE]
	at org.springframework.ldap.core.LdapTemplate.findOne(LdapTemplate.java:1869) ~[spring-ldap-core-2.3.2.RELEASE.jar:2.3.2.RELEASE]
	at org.springframework.data.ldap.repository.query.AbstractLdapRepositoryQuery.execute(AbstractLdapRepositoryQuery.java:70) ~[spring-data-ldap-2.0.2.RELEASE.jar:2.0.2.RELEASE]
	at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.doInvoke(RepositoryFactorySupport.java:597) ~[spring-data-commons-2.0.2.RELEASE.jar:2.0.2.RELEASE]
	at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:580) ~[spring-data-commons-2.0.2.RELEASE.jar:2.0.2.RELEASE]
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185) ~[spring-aop-5.0.2.RELEASE.jar:5.0.2.RELEASE]
	at org.springframework.data.projection.DefaultMethodInvokingMethodInterceptor.invoke(DefaultMethodInvokingMethodInterceptor.java:59) ~[spring-data-commons-2.0.2.RELEASE.jar:2.0.2.RELEASE]
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185) ~[spring-aop-5.0.2.RELEASE.jar:5.0.2.RELEASE]
	at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92) ~[spring-aop-5.0.2.RELEASE.jar:5.0.2.RELEASE]
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185) ~[spring-aop-5.0.2.RELEASE.jar:5.0.2.RELEASE]
	at org.springframework.data.repository.core.support.SurroundingTransactionDetectorMethodInterceptor.invoke(SurroundingTransactionDetectorMethodInterceptor.java:61) ~[spring-data-commons-2.0.2.RELEASE.jar:2.0.2.RELEASE]
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185) ~[spring-aop-5.0.2.RELEASE.jar:5.0.2.RELEASE]
	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212) ~[spring-aop-5.0.2.RELEASE.jar:5.0.2.RELEASE]
	at com.sun.proxy.$Proxy78.findByLogin(Unknown Source) ~[na:na]

[JimHosken]

Is there an anticipated release date for the spring-ldap 2.3.3 release?

We use LDAP as an authenication provider and access it in a read-only / unauthenticated fashion. I have disabled the LDAP Health Indicator in spring boot as a workaround, but this is not an ideal path moving forward.