An immutable utility class to sign a jar file. A caller creates a JarSigner.Builder object, (optionally) sets some parameters, and calls build to create a JarSigner object. This JarSigner object can then be used to sign a jar file. Unless otherwise stated, calling a method of JarSigner or JarSigner.Builder with a null argument will throw a NullPointerException . Example:

    JarSigner signer = new JarSigner.Builder(key, certPath)
            .digestAlgorithm("SHA-256")
            .signatureAlgorithm("SHA256withRSA")
            .build();
    try (ZipFile  in = new ZipFile(inputFile);
            FileOutputStream out = new FileOutputStream(outputFile)) {
        signer.sign(in, out);
getProperty(String key)
Returns the value of an additional implementation-specific property
 indicated by the specified key.
String
getSignatureAlgorithm()
Returns the signature algorithm for this JarSigner.
String
getSignerName()
Returns the signer name of this JarSigner.
getTsa()
Returns the URI of the Time Stamping Authority (TSA).
sign(ZipFile file,
 OutputStream os)
Signs a file into an OutputStream.
public void sign(ZipFile file,
 OutputStream os)
Signs a file into an OutputStream. This method will not close
 file or os.
 If an I/O error or signing error occurs during the signing, then it may
 do so after some bytes have been written. Consequently, the output
 stream may be in an inconsistent state. It is strongly recommended that
 it be promptly closed in this case.

Parameters:
file - the file to sign.
os - the output stream.
Throws:
JarSignerException - if the signing fails.
getDigestAlgorithm
public String getDigestAlgorithm()
Returns the digest algorithm for this JarSigner.
 The return value is never null.

Returns:
the digest algorithm.
getSignatureAlgorithm
public String getSignatureAlgorithm()
Returns the signature algorithm for this JarSigner.
 The return value is never null.

Returns:
the signature algorithm.
getSignerName
public String getSignerName()
Returns the signer name of this JarSigner.
 The return value is never null.

Returns:
the signer name.
getProperty
public String getProperty(String key)
Returns the value of an additional implementation-specific property
 indicated by the specified key. If a property is not set but has a
 default value, the default value will be returned.
Implementation Note:
See JarSigner.Builder.setProperty(java.lang.String, java.lang.String) for a list of
 properties this implementation supports. All property names are
 case-insensitive.
Parameters:
key - the name of the property.
Returns:
the value for the property.
Throws:
UnsupportedOperationException - if the key is not supported
      by this implementation.