When specifying LICENSE_FILES option for LinuxRPMBundler with _any_
valid/invalid values (except for empty List<String> passed), bundling would fail with such an output:

Running [rpmbuild, --version]
Generating RPM for installer to: /tmp/testFxAppWithUtil/bundles
Running [rpmbuild, -bb, /tmp/fxbundler280433665007146966/images/linux-rpm.image/App1.spec, --define, %_sourcedir /tmp/fxbundler280433665007146966/images/linux-rpm.image, --define, %_rpmdir /tmp/testFxAppWithUtil/bundles, --define, %_topdir /tmp/fxbundler280433665007146966/rmpbuildroot] in /tmp/fxbundler280433665007146966/images/linux-rpm.image
java.io.IOException: Exec failed with code 1 command [[rpmbuild, -bb, /tmp/fxbundler280433665007146966/images/linux-rpm.image/App1.spec, --define, %_sourcedir /tmp/fxbundler280433665007146966/images/linux-rpm.image, --define, %_rpmdir /tmp/testFxAppWithUtil/bundles, --define, %_topdir /tmp/fxbundler280433665007146966/rmpbuildroot] in /tmp/fxbundler280433665007146966/images/linux-rpm.image
at com.sun.javafx.tools.packager.bundlers.IOUtils.exec(IOUtils.java:165)
at com.sun.javafx.tools.packager.bundlers.IOUtils.exec(IOUtils.java:138)
at com.sun.javafx.tools.packager.bundlers.IOUtils.exec(IOUtils.java:132)
at com.sun.javafx.tools.packager.bundlers.LinuxRPMBundler.buildRPM(LinuxRPMBundler.java:366)
at com.sun.javafx.tools.packager.bundlers.LinuxRPMBundler.bundle(LinuxRPMBundler.java:171)
at com.sun.javafx.tools.packager.bundlers.LinuxRPMBundler.execute(LinuxRPMBundler.java:441)
at com.oracle.appbundlers.utils.JavaApiBundlingManager.execute(JavaApiBundlingManager.java:33)
at com.oracle.appbundlers.tests.ResourcesTest.testLicense(ResourcesTest.java:142)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:84)
at org.testng.internal.Invoker.invokeMethod(Invoker.java:714)
at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:901)
at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1231)
at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:127)
at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:111)
at org.testng.TestRunner.privateRun(TestRunner.java:767)
at org.testng.TestRunner.run(TestRunner.java:617)
at org.testng.SuiteRunner.runTest(SuiteRunner.java:334)
at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:329)
at org.testng.SuiteRunner.privateRun(SuiteRunner.java:291)
at org.testng.SuiteRunner.run(SuiteRunner.java:240)
at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
at org.testng.TestNG.runSuitesSequentially(TestNG.java:1224)
at org.testng.TestNG.runSuitesLocally(TestNG.java:1149)
at org.testng.TestNG.run(TestNG.java:1057)
at org.testng.remote.RemoteTestNG.run(RemoteTestNG.java:111)
at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:204)
at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:175)
at org.testng.RemoteTestNGStarter.main(RemoteTestNGStarter.java:125)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)

So, we can assume this option is not working at all.