Fix UnsatisfiedLinkError in some rare cases

[res-life]

closes #2699

why this issue occurs

The original code is:

public class Hash {
  public static final int MAX_STACK_DEPTH = getMaxStackDepth();

  static {
    NativeDepsLoader.loadNativeDeps();
  }

  private static native int getMaxStackDepth();
}

The JVM will first execute:

public static final int MAX_STACK_DEPTH = getMaxStackDepth();

then:

  static {
    NativeDepsLoader.loadNativeDeps();
  }

getMaxStackDepth is a native function which is in the JNI so file.
If do not load native so first, the getMaxStackDepth can not be used and it reports: UnsatisfiedLinkError

why this issue do not occur in most cases

If other classes already loaded the JNI so file, then it does not report this error.
e.g.:

JSONUtils.MAX_PATH_DEPTH
Hash.MAX_STACK_DEPTH

The above call seq will not report error, becasue JSONUtils.MAX_PATH_DEPTH will trigger loading JNI so file.

fix

Load the JNI so file first in Hash

Signed-off-by: Chong Gao [email protected]

[res-life]

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