Allow --classpath_entry to be empy.
RELNOTES:None.

PiperOrigin-RevId: 187711775
diff --git a/src/java_tools/import_deps_checker/java/com/google/devtools/build/importdeps/Main.java b/src/java_tools/import_deps_checker/java/com/google/devtools/build/importdeps/Main.java
index d5ac38c..53e1f82 100644
--- a/src/java_tools/import_deps_checker/java/com/google/devtools/build/importdeps/Main.java
+++ b/src/java_tools/import_deps_checker/java/com/google/devtools/build/importdeps/Main.java
@@ -139,8 +139,6 @@
     Options options = optionsParser.getOptions(Options.class);
 
     checkArgument(!options.inputJars.isEmpty(), "--input is required");
-    checkArgument(
-        !options.classpath.isEmpty(), "--classpath_entry is required, at least the bootclasspath");
     checkArgument(!options.bootclasspath.isEmpty(), "--bootclasspath_entry is required");
     return options;
   }