META-INF/MANIFEST.MF is a text file that is included inside a JAR to specify metadata about the file. Java’s default ClassLoader reads the attributes defined in MANIFEST.MF and appends the specified dependencies to its internal classpath. The encryption plug‑in ID is the value of the Bundle-SymbolicName property in the manifest file for the encryption plug‑in. You need to change this property when you deploy multiple instances of the default encryption plug‑in, as described later in this chapter. Listing 26‑2 shows the contents of the default MANIFEST.MF.