Question 1mediummultiple choice
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Allows one or more threads to wait until a count reaches zero
Allows a set of threads to wait for each other to reach a common barrier point
Controls access to a resource via a permit system
Allows two threads to exchange objects at a synchronization point
A reusable barrier that supports dynamic number of parties
grant codeBase "file:/home/application/-" {
permission java.io.FilePermission "/etc/config/-", "read";
permission java.io.FilePermission "/var/log/-", "read,write";
permission java.lang.RuntimePermission "queuePrintJob";
};Exception in thread "main" java.io.InvalidClassException: com.example.User; local class incompatible: stream classdesc serialVersionUID = 5564992945715864724, local class serialVersionUID = -4978412458979645732
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, key, new IvParameterSpec(iv));
try (CipherOutputStream cos = new CipherOutputStream(new FileOutputStream("data.enc"), cipher)) {
Files.copy(Path.of("data.txt"), cos);
}CLI output of 'keytool -list -keystore mykeystore.jks -storepass changeit': alias: myserver Certificate fingerprint (MD5): 0F:AA:3B:87:1C:3F:BE:21:4D:2E:5F:6A:7B:8C:9D:0E
Policy file snippet:
grant codeBase "file:/home/user/app/-" {
permission java.io.FilePermission "/data/-", "read,write";
permission java.net.SocketPermission "*", "connect";
};Error log: java.io.StreamCorruptedException: invalid stream header: 73657200
alias: mykey
Creation date: Jan 15, 2024
Entry type: PrivateKeyEntry
Certificate chain length: 1
Certificate[1]:
Owner: CN=MyApp, OU=Dev, O=Company, L=City, ST=State, C=US
Issuer: CN=MyCA, OU=CA, O=Company, L=City, ST=State, C=US
Serial number: 1234abcd
Valid from: Wed Jan 15 10:00:00 UTC 2024 until: Thu Jan 15 10:00:00 UTC 2026
Certificate fingerprints:
SHA1: 12:34:56:78:90:ab:cd:ef:12:34:56:78:90:ab:cd:ef:12:34:56:78
SHA256: ab:cd:ef:12:34:56:78:90:ab:cd:ef:12:34:56:78:90:ab:cd:ef:12:34:56:78:90:ab:cd:ef:12:34:56:78:90:ab
Signature algorithm name: SHA256withRSA
Subject Public Key Algorithm: 2048-bit RSA key
Version: 3grant codeBase "file:${user.home}/lib/*" {
permission java.io.FilePermission "${user.home}/config.ini", "read";
permission java.io.FilePermission "${user.home}/logs/-", "read,write";
// Missing permission for data files
};
grant codeBase "file:/app/lib/app.jar" {
permission java.security.AllPermission;
};grant codeBase "file:/opt/app/lib/*" {
permission java.io.FilePermission "/data/config/*", "read";
permission java.io.FilePermission "/logs/app.log", "write";
};