spring-projects/spring-boot · error · IllegalStateException

Unexpected: attribute 'Ready' not available

Error message

Unexpected: attribute 'Ready' not available

What it means

Error "Unexpected: attribute 'Ready' not available" thrown in spring-projects/spring-boot.

Source

Thrown at build-plugin/spring-boot-maven-plugin/src/main/java/org/springframework/boot/maven/SpringApplicationAdminClient.java:69

		this.objectName = toObjectName(jmxName);
	}

	/**
	 * Check if the spring application managed by this instance is ready. Returns
	 * {@code false} if the mbean is not yet deployed so this method should be repeatedly
	 * called until a timeout is reached.
	 * @return {@code true} if the application is ready to service requests
	 * @throws MojoExecutionException if the JMX service could not be contacted
	 */
	boolean isReady() throws MojoExecutionException {
		try {
			return (Boolean) this.connection.getAttribute(this.objectName, "Ready");
		}
		catch (InstanceNotFoundException ex) {
			return false; // Instance not available yet
		}
		catch (AttributeNotFoundException ex) {
			throw new IllegalStateException("Unexpected: attribute 'Ready' not available", ex);
		}
		catch (ReflectionException ex) {
			throw new MojoExecutionException("Failed to retrieve Ready attribute", ex.getCause());
		}
		catch (MBeanException | IOException ex) {
			throw new MojoExecutionException(ex.getMessage(), ex);
		}
	}

	/**
	 * Stop the application managed by this instance.
	 * @throws MojoExecutionException if the JMX service could not be contacted
	 * @throws IOException if an I/O error occurs
	 * @throws InstanceNotFoundException if the lifecycle mbean cannot be found
	 */
	void stop() throws MojoExecutionException, IOException, InstanceNotFoundException {
		try {
			this.connection.invoke(this.objectName, "shutdown", null, null);

View on GitHub (pinned to 5b2dbdbb8b)

When it happens

Trigger: Thrown at build-plugin/spring-boot-maven-plugin/src/main/java/org/springframework/boot/maven/SpringApplicationAdminClient.java:69 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of spring-projects/spring-boot@5b2dbdbb8b (2026-08-04). Data as JSON: /data/errors/d6e439954b5a89d1.json. Report an issue: GitHub.