This file is indexed.

/usr/lib/jvm/java-1.5.0-gcj-4.6/bin/jdb is in gcj-4.6-jdk 4.6.3-1.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/sh

# Placeholder script to fake a
# JDK compatible JAVA_HOME directory.

echo >&2 "This script is only a placeholder."
echo >&2 "Some programs need a JDK rather than only a JRE to work."
echo >&2 "They test for this tool to detect a JDK installation, but"
echo >&2 "don't really need its functionality to work correctly."