output: #fixed code
                               protected Function<Publisher<?>, Publisher<?>> lookup(String name) {
  		Function<Publisher<?>, Publisher<?>> function = this.function;
  		if (name != null && this.catalog != null) {
  			@SuppressWarnings("unchecked")
  			Function<Publisher<?>, Publisher<?>> preferred = this.catalog
  					.lookup(Function.class, name);
  			if (preferred != null) {
  				function = preferred;
  			}
  		}
  		if (function != null) {
  			return function;
  		}
  		throw new IllegalStateException("No function defined with name=" + name);
  	}
input: #vulnerable code 
                               protected Function<Publisher<?>, Publisher<?>> lookup(String name) {
  		Function<Publisher<?>, Publisher<?>> function = this.function;
  		if (name != null && this.catalog != null) {
  			Function<Publisher<?>, Publisher<?>> preferred = this.catalog
  					.lookup(Function.class, name);
  			if (preferred != null) {
  				function = preferred;
  			}
  		}
  		if (function != null) {
  			return function;
  		}
  		throw new IllegalStateException("No function defined");
  	} 
                              #location 2 
                              #vulnerability type THREAD_SAFETY_VIOLATION