BeanNotOfRequiredTypeFailureAnalyzer Class — spring-boot Architecture

Source Code

core/spring-boot/src/main/java/org/springframework/boot/diagnostics/analyzer/BeanNotOfRequiredTypeFailureAnalyzer.java lines 37–66

public class BeanNotOfRequiredTypeFailureAnalyzer extends AbstractFailureAnalyzer<BeanNotOfRequiredTypeException> {

	private static final String ACTION = "Consider injecting the bean as one of its "
			+ "interfaces or forcing the use of CGLib-based "
			+ "proxies by setting proxyTargetClass=true on @EnableAsync and/or @EnableCaching.";

	@Override
	protected @Nullable FailureAnalysis analyze(Throwable rootFailure, BeanNotOfRequiredTypeException cause) {
		if (!Proxy.isProxyClass(cause.getActualType())) {
			return null;
		}
		return new FailureAnalysis(getDescription(cause), ACTION, cause);
	}

	private String getDescription(BeanNotOfRequiredTypeException ex) {
		StringWriter description = new StringWriter();
		PrintWriter printer = new PrintWriter(description);
		printer.printf("The bean '%s' could not be injected because it is a JDK dynamic proxy%n%n", ex.getBeanName());
		printer.printf("The bean is of type '%s' and implements:%n", ex.getActualType().getName());
		for (Class<?> actualTypeInterface : ex.getActualType().getInterfaces()) {
			printer.println("\t" + actualTypeInterface.getName());
		}
		printer.printf("%nExpected a bean of type '%s' which implements:%n", ex.getRequiredType().getName());
		for (Class<?> requiredTypeInterface : ex.getRequiredType().getInterfaces()) {
			printer.println("\t" + requiredTypeInterface.getName());
		}
		return description.toString();
	}

}