- // Check if all required services are already provided by earlier
- // systems.
- RequiredInterface[] required = system.getRequiredInterfaces();
-
- for (RequiredInterface descriptor : required) {
- ProvidedInterface[] filtered = filterProvidedServices(
- descriptor, allProvided);
-
- if (filtered.length == 0) {
- throw new SystemAssemblyException(
- "Service '"
- + descriptor
- + "' required by system '"
- + system
- + "' is not provided by systems that are started earlier");
+ try {
+ // Check if all required services are already provided by
+ // earlier
+ // systems.
+ RequiredInterface[] required = system.getRequiredInterfaces();
+
+ for (RequiredInterface descriptor : required) {
+ ProvidedInterface[] filtered = filterProvidedServices(
+ descriptor, allProvided);
+
+ if (filtered.length == 0) {
+ throw new SystemAssemblyException(
+ "Service '"
+ + descriptor
+ + "' required by system '"
+ + system
+ + "' is not provided by systems that are started earlier");
+ }
+ if (filtered.length > 1) {
+ throw new SystemAssemblyException(
+ "Service '"
+ + descriptor
+ + "' required by system '"
+ + system
+ + "' matches multiple services provided by other systems: "
+ + Arrays.asList(filtered));
+ }
+ descriptor.setProvider(filtered[0]);