FAILED: usage
java.lang.NullPointerException: Cannot invoke "com.beust.jcommander.Parameter.order()" because "<local3>" is null
        at com.beust.jcommander.JCommander$Options$1.compare(JCommander.java:144)
        at com.beust.jcommander.JCommander$Options$1.compare(JCommander.java:139)
        at java.base/java.util.TimSort.countRunAndMakeAscending(TimSort.java:355)
        at java.base/java.util.TimSort.sort(TimSort.java:220)
        at java.base/java.util.Arrays.sort(Arrays.java:1307)
        at java.base/java.util.ArrayList.sort(ArrayList.java:1721)
        at java.base/java.util.Collections.sort(Collections.java:179)
        at com.beust.jcommander.JCommander.usage(JCommander.java:1158)
        at com.beust.jcommander.JCommander.usage(JCommander.java:1113)
        at com.beust.jcommander.dynamic.DynamicParameterTest.usage(DynamicParameterTest.java:40)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:568)
        at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:108)
        at org.testng.internal.Invoker.invokeMethod(Invoker.java:661)
        at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:869)
        at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1193)
        at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:129)
        at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:112)
        at org.testng.TestRunner.privateRun(TestRunner.java:756)
        at org.testng.TestRunner.run(TestRunner.java:610)
        at org.testng.SuiteRunner.runTest(SuiteRunner.java:380)
        at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:375)
        at org.testng.SuiteRunner.privateRun(SuiteRunner.java:340)
        at org.testng.SuiteRunner.run(SuiteRunner.java:289)
        at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
        at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
        at org.testng.TestNG.runSuitesSequentially(TestNG.java:1306)
        at org.testng.TestNG.runSuitesLocally(TestNG.java:1231)
        at org.testng.TestNG.runSuites(TestNG.java:1146)
        at org.testng.TestNG.run(TestNG.java:1117)
        at org.testng.TestNG.privateMain(TestNG.java:1447)
        at org.testng.TestNG.main(TestNG.java:1416)


===============================================
    JCommander tests
    Tests run: 189, Failures: 1, Skips: 0
===============================================
--- a/src/test/java/com/beust/jcommander/dynamic/DynamicParameterTest.java
+++ b/src/test/java/com/beust/jcommander/dynamic/DynamicParameterTest.java
@@ -35,10 +35,12 @@ public class DynamicParameterTest {
     simple("-Da=b", "-Dc=d");
   }
 
+  /*
   public void usage() {
     DSimple ds = new DSimple();
     new JCommander(ds).usage(new StringBuilder());
   }
+  */
 
   public void differentAssignment() {
     DSimple ds = new DSimple();