src/jdk.jlink/share/classes/jdk/tools/jlink/builder/DefaultImageBuilder.java

*** 149,168 ****
      }
  
      @Override
      public void storeFiles(ResourcePool files) {
          try {
!             // populate targetOsName field up-front because it's used elsewhere.
!             Optional<ResourcePoolModule> javaBase = files.moduleView().findModule("java.base");
!             javaBase.ifPresent(mod -> {
!                 // fill release information available from transformed "java.base" module!
!                 ModuleDescriptor desc = mod.descriptor();
!                 desc.osName().ifPresent(s -> {
!                     this.targetOsName = s;
!                 });
!             });
! 
              if (this.targetOsName == null) {
                  throw new PluginException("ModuleTarget attribute is missing for java.base module");
              }
  
              checkResourcePool(files);
--- 149,160 ----
      }
  
      @Override
      public void storeFiles(ResourcePool files) {
          try {
!             this.targetOsName = files.moduleView().
!                 findModule("java.base").get().osName();
              if (this.targetOsName == null) {
                  throw new PluginException("ModuleTarget attribute is missing for java.base module");
              }
  
              checkResourcePool(files);