Sqoop2-shell failed to launch for 1.99.7

I freshly installed Sqoop2 1.99.7 on my cluster. However, I fail to start sqoop2-shell and I have no such problem with 1.99.5 client. The error message is attached below:

```
$ ./sqoop2-shell
Setting conf dir: /home/db2inst1/sqoop-1.99.7-bin-hadoop200/bin/../conf
Sqoop home directory: /home/db2inst1/sqoop-1.99.7-bin-hadoop200
Sqoop Shell: Type 'help' or '\h' for help.

FATAL: java.lang.IncompatibleClassChangeError: Implementing class
java.lang.IncompatibleClassChangeError: Implementing class
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.getDeclaredConstructors0(Native Method)
at java.lang.Class.privateGetDeclaredConstructors(Class.java:2671)
at java.lang.Class.getDeclaredConstructors(Class.java:2020)
at org.codehaus.groovy.reflection.CachedClass$2$1.run(CachedClass.java:71)
at java.security.AccessController.doPrivileged(Native Method)
at org.codehaus.groovy.reflection.CachedClass$2.initValue(CachedClass.java:68)
at org.codehaus.groovy.reflection.CachedClass$2.initValue(CachedClass.java:66)
at org.codehaus.groovy.util.LazyReference.getLocked(LazyReference.java:46)
at org.codehaus.groovy.util.LazyReference.get(LazyReference.java:33)
at org.codehaus.groovy.reflection.CachedClass.getConstructors(CachedClass.java:265)
at groovy.lang.MetaClassImpl.<init>(MetaClassImpl.java:215)
at groovy.lang.MetaClassImpl.<init>(MetaClassImpl.java:225)
at groovy.lang.MetaClassRegistry$MetaClassCreationHandle.createNormalMetaClass(MetaClassRegistry.java:168)
at groovy.lang.MetaClassRegistry$MetaClassCreationHandle.createWithCustomLookup(MetaClassRegistry.java:158)
at groovy.lang.MetaClassRegistry$MetaClassCreationHandle.create(MetaClassRegistry.java:141)
at org.codehaus.groovy.reflection.ClassInfo.getMetaClassUnderLock(ClassInfo.java:250)
at org.codehaus.groovy.reflection.ClassInfo.getMetaClass(ClassInfo.java:282)
at org.codehaus.groovy.runtime.metaclass.MetaClassRegistryImpl.getMetaClass(MetaClassRegistryImpl.java:255)
at org.codehaus.groovy.runtime.InvokerHelper.getMetaClass(InvokerHelper.java:872)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.createCallConstructorSite(CallSiteArray.java:84)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCallConstructor(CallSiteArray.java:57)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callConstructor(AbstractCallSite.java:230)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callConstructor(AbstractCallSite.java:250)
at org.codehaus.groovy.tools.shell.InteractiveShellRunner.<init>(InteractiveShellRunner.groovy:49)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at org.codehaus.groovy.reflection.CachedConstructor.invoke(CachedConstructor.java:77)
at org.codehaus.groovy.reflection.CachedConstructor.doConstructorInvoke(CachedConstructor.java:71)
at org.codehaus.groovy.runtime.callsite.ConstructorSite.callConstructor(ConstructorSite.java:42)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCallConstructor(CallSiteArray.java:57)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callConstructor(AbstractCallSite.java:230)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callConstructor(AbstractCallSite.java:250)
at org.codehaus.groovy.tools.shell.Groovysh.run(Groovysh.groovy:564)
at org.apache.sqoop.shell.SqoopShell.main(SqoopShell.java:156)
Exception in thread "Thread-5" java.lang.NullPointerException
at org.apache.sqoop.shell.SqoopShell$1.run(SqoopShell.java:84)
```

My cluster is built from scratch. I don't use any open data platform (CDH, HDP, IOP, and so on). In addition, only HDFS, YARN, Hive, and Sqoop2 is installed.

Thanks in advance for anyone who can take a look at this issue.