}

    /**
     * Creates a message.
     *
     * @param cause the underlying exception
     * @return the message
     */
    protected static String createMessage(final SAXException cause) {
        final StringBuilder buf = new StringBuilder(100);
        buf.append(cause);
        if (cause instanceof SAXParseException) {

     * @deprecated use {@code META-INF/maven/extension.xml} to define artifacts exported by Maven core and plugin
     *             extensions.
     */
    @Deprecated
    void excludeArtifact(String artifactId);

    Set<String> getCoreArtifactExcludes();

package cmd

import (
	"crypto/md5"
	"encoding/hex"

	"github.com/minio/minio/internal/hash/sha256"
)

// getSHA256Hash returns SHA-256 hash in hex encoding of given data.
func getSHA256Hash(data []byte) string {
	return hex.EncodeToString(getSHA256Sum(data))
}

// getSHA256Hash returns SHA-256 sum of given data.
func getSHA256Sum(data []byte) []byte {
	hash := sha256.New()
	hash.Write(data)
	return hash.Sum(nil)
}

     * @param in The input stream.
     * @param params The parameters.
     * @return The extracted data.
     */
    @Override
    public ExtractData getText(final InputStream in, final Map<String, String> params) {
        if (in == null) {
            throw new CrawlerSystemException("The inputstream is null.");
        }
        try {
            @SuppressWarnings("resource")

     */
    boolean match(ResponseData responseData);

    /**
     * Retrieves the unique identifier for the rule.
     *
     * @return the rule's unique identifier as a String.
     */
    String getRuleId();

    /**
     * Retrieves the response processor associated with this rule.
     *
     * @return the response processor
     */
    ResponseProcessor getResponseProcessor();

Wir bauen auf dem vorherigen Kapitel auf.

## Über JWT

JWT bedeutet „JSON Web Tokens“.

Es ist ein Standard, um ein JSON-Objekt in einem langen, kompakten String ohne Leerzeichen zu kodieren. Das sieht so aus:

```
eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c
```

Vamos a empezar desde donde lo dejamos en el capítulo anterior e incrementarlo.

## Acerca de JWT

JWT significa "JSON Web Tokens".

Es un estándar para codificar un objeto JSON en un string largo y denso sin espacios. Se ve así:

```
eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c
```

	// freed, such as by calling C.free (be sure to include stdlib.h
	// if C.free is needed).
	func C.CBytes([]byte) unsafe.Pointer

	// C string to Go string
	func C.GoString(*C.char) string

	// C data with explicit length to Go string
	func C.GoStringN(*C.char, C.int) string

	// C data with explicit length to Go []byte
	func C.GoBytes(unsafe.Pointer, C.int) []byte

        // Test with String component
        container.singleton("stringComponent", "TestString");
        CrawlerPooledObjectFactory<String> stringFactory = new CrawlerPooledObjectFactory<>();
        stringFactory.crawlerContainer = container;
        stringFactory.setComponentName("stringComponent");

        String stringComponent = stringFactory.create();

   *
   * <p>Suppose {@code x} is a queue known to contain only strings. The following code can be used
   * to dump the queue into a newly allocated array of {@code String}:
   *
   * <pre>
   *     String[] y = x.toArray(new String[0]);</pre>
   *
   * <p>Note that {@code toArray(new Object[0])} is identical in function to {@code toArray()}.
   *