Package com.vaadin.flow.server.scanner

Class JarManifestChecker

java.lang.Object

com.vaadin.flow.server.scanner.JarManifestChecker

public class JarManifestChecker
extends Object

Utility class for checking if JAR files contain the Vaadin package version manifest attribute.

This is used by the annotation scanner to determine which JARs should be scanned for Vaadin annotations. Only JARs with the Vaadin-Package-Version manifest attribute are considered Vaadin add-ons.

Results are cached to avoid repeated JAR reads for performance.

Since:

25.0

Field Summary

Fields

Modifier and Type	Field	Description
static final String	VAADIN_PACKAGE_VERSION	The manifest attribute name that identifies a Vaadin add-on package.

Method Summary

Modifier and Type	Method	Description
static void	clearCache()	Clears the manifest cache.
static int	getCacheSize()	Returns the current size of the manifest cache.
static boolean	hasVaadinManifest(File jarFile)	Checks if a JAR file has the Vaadin-Package-Version manifest attribute.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

VAADIN_PACKAGE_VERSION

public static final String VAADIN_PACKAGE_VERSION

The manifest attribute name that identifies a Vaadin add-on package.

See Also:

• Constant Field Values

Method Details

hasVaadinManifest

public static boolean hasVaadinManifest(File jarFile)

Checks if a JAR file has the Vaadin-Package-Version manifest attribute.

Results are cached to avoid repeated JAR reads. The cache uses the File object as the key, so if the same file is checked multiple times, the manifest is only read once.

Parameters:

jarFile - the JAR file to check, not null

Returns:

true if the JAR has a manifest with the Vaadin-Package-Version attribute, false otherwise

clearCache

public static void clearCache()

Clears the manifest cache. This is mainly useful for testing purposes.

getCacheSize

public static int getCacheSize()

Returns the current size of the manifest cache. This is mainly useful for testing and monitoring purposes.

Returns:

the number of cached manifest check results