如何确认生成XXX.jar文件所使用的MongoDB版本？

Got it, let's walk through how to confirm both the Java version used to build your XXX.jar and the MongoDB driver version it contains:

You already started by unzipping the JAR, so here are two reliable ways to get the Java version:

• Check the META-INF/MANIFEST.MF file inside the unzipped folder. Look for fields like Built-Jdk or Created-By — these will directly tell you the Java version used to compile the code.
• If the manifest doesn't have that info, use the javap command on any .class file. For example:

  javap -v com/mongodb/MongoClient.class
  

  Look for the major version line in the output. Map that number to the Java version (e.g., 52 = Java 8, 55 = Java 11, 61 = Java 17).

Since you see the com/mongodb directory, here are the most straightforward methods to find the version:

• Check Maven metadata files: Look in the META-INF/maven/com.mongodb directory (if it exists). You'll likely find a pom.xml or pom.properties file — both will have a version field that specifies the exact MongoDB driver version.
• Inspect version constants in class files: Use a Java decompiler tool (like JD-GUI) or the javap command to look at classes like com.mongodb.MongoVersion or com.mongodb.client.MongoClients. These classes usually have a public static constant for the version, something like:

  public static final String VERSION = "4.9.1";
  

• Look for nested driver JARs: If your XXX.jar includes other JARs (often in a lib folder), check the filenames of any MongoDB-related JARs. They typically include the version number, e.g., mongodb-driver-sync-4.9.1.jar.
• Quick search with command line: If you prefer using the terminal, run this command to scan the JAR for version-related files:

  jar tf XXX.jar | grep -E "(pom\.properties|MongoVersion)"
  

  This will point you directly to files that contain the version info, so you don't have to dig through the entire folder manually.

内容的提问来源于stack exchange，提问作者pooja