LDAPS flow ignores configured truststore and fails with CERTIFICATE_UNKNOWN error

[prthakre]

We are trying to use LDAPS with TLS over port 636, this however results in failure.
javax.net.debug system property is set to "ssl:handshake:verbose:keymanager:trustmanager" for debugging.

DefaultTlsDirContextAuthenticationStrategy is configured using a custom SSLSocketFactory with a custom truststore.

The custom truststore is correctly picked up during configuration:
[javax.net](http://javax.net/).ssl|DEBUG|10|main|X509TrustManagerImpl.java:82|adding as trusted certificates (

But, is quickly over-written with default cacerts

javax.net.ssl|DEBUG|93|XNIO-1 task-1|TrustStoreManager.java:113|trustStore is: /Library/Java/JavaVirtualMachines/temurin-21.jdk/Contents/Home/lib/security/cacerts trustStore type is: pkcs12

And, this finally results in failure:
javax.net.ssl|DEBUG|D3|XNIO-1 task-1|2024-06-12 09:48:37.369 IST|CertificateMessage.java:1135|Consuming server Certificate handshake message ( "Certificate": { "certificate_request_context": "", "certificate_list":

javax.net.ssl|DEBUG|93|XNIO-1 task-1|CertificateMessage.java:1135|Consuming server Certificate handshake message ( "Certificate": { "certificate_request_context": "", "certificate_list": [ { "certificate" : { "version" : "v3",

javax.net.ssl|ERROR|93|XNIO-1 task-1|TransportContext.java:370|Fatal (CERTIFICATE_UNKNOWN): PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target (

The same code/configuration works with STARTTLS over port 389 and the only difference being that the custom truststore is not being over-written.
javax.net.ssl|DEBUG|10|main|2024-06-12 09:50:06.124 IST|X509TrustManagerImpl.java:82|adding as trusted certificates ( "certificate" : {

javax.net.ssl|DEBUG|D3|XNIO-1 task-1|CertificateMessage.java:1135|Consuming server Certificate handshake message ( "Certificate": { "certificate_request_context": "", "certificate_list": [

javax.net.ssl|DEBUG|D3|XNIO-1 task-1|X509TrustManagerImpl.java:246|Found trusted certificate ( "certificate" : {

Version information:
JDK: 21
spring-boot: 3.3.0
spring-ldap: 3.2.3

Also, native-pooling is disabled.