modules/builder/src/main/java/org/apache/tuscany/sca/builder/impl/WireBuilderImpl.java [712:751]:
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    private void validateReferenceMultiplicity(Composite composite, Component component, Monitor monitor) {
        for (ComponentReference componentReference : component.getReferences()) {
            if (!validateMultiplicity(componentReference.getMultiplicity(),
                                      componentReference.getEndpointReferences())) {
                if (componentReference.getEndpointReferences().isEmpty()) {

                    // No error if the reference is promoted out of the current composite
                    boolean promoted = false;
                    for (Reference reference : composite.getReferences()) {
                        CompositeReference compositeReference = (CompositeReference)reference;
                        if (compositeReference.getPromotedReferences().contains(componentReference)) {
                            promoted = true;
                            break;
                        }
                    }
                    if (!promoted && !componentReference.isForCallback() && !componentReference.isWiredByImpl()) {
                        Monitor.error(monitor,
                                      this,
                                      Messages.ASSEMBLY_VALIDATION,
                                      "ReferenceWithoutTargets",
                                      composite.getName().toString(),
                                      componentReference.getName());
                    }
                } else {
                    // no error if reference is autowire and more targets
                    // than multiplicity have been found 
                    if (Boolean.TRUE.equals(componentReference.getAutowire())) {
                        break;
                    }

                    Monitor.error(monitor,
                                  this,
                                  Messages.ASSEMBLY_VALIDATION,
                                  "TooManyReferenceTargets",
                                  componentReference.getName());
                }
            }
        }

    }
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modules/builder/src/main/java/org/apache/tuscany/sca/builder/impl/EndpointReferenceBuilderImpl.java [512:551]:
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    private void validateReferenceMultiplicity(Composite composite, Component component, Monitor monitor) {
        for (ComponentReference componentReference : component.getReferences()) {
            if (!validateMultiplicity(componentReference.getMultiplicity(),
                                      componentReference.getEndpointReferences())) {
                if (componentReference.getEndpointReferences().isEmpty()) {

                    // No error if the reference is promoted out of the current composite
                    boolean promoted = false;
                    for (Reference reference : composite.getReferences()) {
                        CompositeReference compositeReference = (CompositeReference)reference;
                        if (compositeReference.getPromotedReferences().contains(componentReference)) {
                            promoted = true;
                            break;
                        }
                    }
                    if (!promoted && !componentReference.isForCallback() && !componentReference.isWiredByImpl()) {
                        Monitor.error(monitor,
                                      this,
                                      Messages.ASSEMBLY_VALIDATION,
                                      "ReferenceWithoutTargets",
                                      composite.getName().toString(),
                                      componentReference.getName());
                    }
                } else {
                    // no error if reference is autowire and more targets
                    // than multiplicity have been found 
                    if (Boolean.TRUE.equals(componentReference.getAutowire())) {
                        break;
                    }

                    Monitor.error(monitor,
                                  this,
                                  Messages.ASSEMBLY_VALIDATION,
                                  "TooManyReferenceTargets",
                                  componentReference.getName());
                }
            }
        }

    }
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