[Bug]: Underlying NullPointerException in ContainerLessJdbcDelegate when using ScriptUtils

Module

Core

Testcontainers version

1.21.4

Using the latest Testcontainers version?

Yes

Host OS

Windows

Host Arch

x64

Docker version

Client:                                                              
 Version:           29.0.2-rd                                        
 API version:       1.51 (downgraded from 1.52)                      
 Go version:        go1.25.4                                         
 Git commit:        5a2d7eb                                          
 Built:             Tue Nov 18 23:34:16 2025                         
 OS/Arch:           windows/amd64                                    
 Context:           default                                          
                                                                     
Server:                                                              
 Engine:                                                             
  Version:          28.3.3                                           
  API version:      1.51 (minimum version 1.24)                      
  Go version:       go1.24.8                                         
  Git commit:       bea959c7b793b32a893820b97c4eadc7c87fabb0         
  Built:            Sun Oct 12 08:01:14 2025                         
  OS/Arch:          linux/amd64                                      
  Experimental:     false                                            
 containerd:                                                         
  Version:          v2.1.5                                           
  GitCommit:        fcd43222d6b07379a4be9786bda52438f0dd16a1         
 runc:                                                               
  Version:          1.3.3                                            
  GitCommit:        d842d7719497cc3b774fd71620278ac9e17710e0         
 docker-init:                                                        
  Version:          0.19.0                                           
  GitCommit:

What happened?

Hi,

When running a script with ScriptUtils on ContainerLessJdbcDelegate an underlying NullPointerException occurs.

ScriptUtils.runInitScript( new ContainerLessJdbcDelegate( connection ), initScript );

Reason is the code in org.testcontainers.jdbc.JdbcDatabaseDelegate#closeConnectionQuietly. It closes the connection which is null, as the ContainerLessJdbcDelegate has an own connection field. This could probably be solved by implementing closeConnectionQuietly in ContainerLessJdbcDelegate and closing the own field instead of the one on the super class.

Thank you and best regards

Nils

Relevant log output

2026-03-12 08:28:11 ERROR [main           ] o.t.j.JdbcDatabaseDelegate - Could not close JDBC connection
 java.lang.NullPointerException: Cannot invoke "java.sql.Connection.close()" because "this.connection" is null
 	at org.testcontainers.jdbc.JdbcDatabaseDelegate.closeConnectionQuietly(JdbcDatabaseDelegate.java:72)
 	at org.testcontainers.jdbc.JdbcDatabaseDelegate.closeConnectionQuietly(JdbcDatabaseDelegate.java:16)
 	at org.testcontainers.delegate.AbstractDatabaseDelegate.close(AbstractDatabaseDelegate.java:45)
 	at org.testcontainers.ext.ScriptUtils.executeDatabaseScript(ScriptUtils.java:308)
 	at org.testcontainers.ext.ScriptUtils.executeDatabaseScript(ScriptUtils.java:225)
 	at org.testcontainers.ext.ScriptUtils.runInitScript(ScriptUtils.java:213)

Additional Information

No response

Start with org.testcontainers.jdbc.JdbcDatabaseDelegate#closeConnectionQuietly and inspect ContainerLessJdbcDelegate's connection field, then trace the ScriptUtils.runInitScript call shown in the report. Add regression coverage for running a script with ContainerLessJdbcDelegate and verify it completes without a NullPointerException while closing the correct connection.