maven打包，unable to find a single main class

maven打包，unable to find a single main class from the following candidates分析

Repackager.java

	private Manifest buildManifest(JarFile source) throws IOException {
		Manifest manifest = source.getManifest();
		if (manifest == null) {
			manifest = new Manifest();
			manifest.getMainAttributes().putValue("Manifest-Version", "1.0");
		}
		manifest = new Manifest(manifest);
		String startClass = this.mainClass;
		if (startClass == null) {
			startClass = manifest.getMainAttributes().getValue(MAIN_CLASS_ATTRIBUTE);
		}
		if (startClass == null) {
			startClass = findMainMethodWithTimeoutWarning(source);
		}
		String launcherClassName = this.layout.getLauncherClassName();
		if (launcherClassName != null) {
			manifest.getMainAttributes().putValue(MAIN_CLASS_ATTRIBUTE,
					launcherClassName);
			if (startClass == null) {
				throw new IllegalStateException("Unable to find main class");
			}
			manifest.getMainAttributes().putValue(START_CLASS_ATTRIBUTE, startClass);
		}
		else if (startClass != null) {
			manifest.getMainAttributes().putValue(MAIN_CLASS_ATTRIBUTE, startClass);
		}
		String bootVersion = getClass().getPackage().getImplementationVersion();
		manifest.getMainAttributes().putValue(BOOT_VERSION_ATTRIBUTE, bootVersion);
		manifest.getMainAttributes().putValue(BOOT_CLASSES_ATTRIBUTE,
				(this.layout instanceof RepackagingLayout)
						? ((RepackagingLayout) this.layout).getRepackagedClassesLocation()
						: this.layout.getClassesLocation());
		String lib = this.layout.getLibraryDestination("", LibraryScope.COMPILE);
		if (StringUtils.hasLength(lib)) {
			manifest.getMainAttributes().putValue(BOOT_LIB_ATTRIBUTE, lib);
		}
		return manifest;
	}

	protected String findMainMethod(JarFile source) throws IOException {
		return MainClassFinder.findSingleMainClass(source,
				this.layout.getClassesLocation(), SPRING_BOOT_APPLICATION_CLASS_NAME);
	}

没有配置org.springframework.boot.autoconfigure.SpringBootApplication，或者配置多个

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