acrescentei o greko no path e agora esta dando um erro diferente do seu.
1512054865418 geckodriver INFO geckodriver 0.19.1
1512054865437 geckodriver INFO Listening on 127.0.0.1:7322
Exception in thread "main" org.openqa.selenium.SessionNotCreatedException: Unable to find a matching set of capabilities
Build info: version: '3.8.0', revision: '924c4067df', time: '2017-11-30T11:36:59.109Z'
System info: host: 'DINFO-34937', ip: '10.16.4.35', os.name: 'Windows 7', os.arch: 'amd64', os.version: '6.1', java.version: '1.8.0_31'
Driver info: driver.version: FirefoxDriver
remote stacktrace: stack backtrace:
0: 0x47e934 - <no info>
1: 0x47f0a3 - <no info>
2: 0x442511 - <no info>
3: 0x4436da - <no info>
4: 0x42a890 - <no info>
5: 0x406f5e - <no info>
6: 0x40cfc9 - <no info>
7: 0x6bef19 - <no info>
8: 0x420756 - <no info>
9: 0x6b96e0 - <no info>
10: 0x776f59cd - BaseThreadInitThunk
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:408)
at org.openqa.selenium.remote.W3CHandshakeResponse.lambda$new$0(W3CHandshakeResponse.java:57)
at org.openqa.selenium.remote.W3CHandshakeResponse$$Lambda$119/1122606666.apply(Unknown Source)
at org.openqa.selenium.remote.W3CHandshakeResponse.lambda$getResponseFunction$2(W3CHandshakeResponse.java:104)
at org.openqa.selenium.remote.W3CHandshakeResponse$$Lambda$121/1390869998.apply(Unknown Source)
at org.openqa.selenium.remote.ProtocolHandshake.lambda$createSession$0(ProtocolHandshake.java:123)
at org.openqa.selenium.remote.ProtocolHandshake$$Lambda$122/1645547422.apply(Unknown Source)
at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
at java.util.Spliterators$ArraySpliterator.tryAdvance(Spliterators.java:958)
at java.util.stream.ReferencePipeline.forEachWithCancel(ReferencePipeline.java:126)
at java.util.stream.AbstractPipeline.copyIntoWithCancel(AbstractPipeline.java:529)
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:516)
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:502)
at java.util.stream.FindOps$FindOp.evaluateSequential(FindOps.java:152)
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.util.stream.ReferencePipeline.findFirst(ReferencePipeline.java:464)
at org.openqa.selenium.remote.ProtocolHandshake.createSession(ProtocolHandshake.java:126)
at org.openqa.selenium.remote.ProtocolHandshake.createSession(ProtocolHandshake.java:73)
at org.openqa.selenium.remote.HttpCommandExecutor.execute(HttpCommandExecutor.java:142)
at org.openqa.selenium.remote.service.DriverCommandExecutor.execute(DriverCommandExecutor.java:83)
at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:601)
at org.openqa.selenium.remote.RemoteWebDriver.startSession(RemoteWebDriver.java:219)
at org.openqa.selenium.remote.RemoteWebDriver.<init>(RemoteWebDriver.java:142)
at org.openqa.selenium.firefox.FirefoxDriver.<init>(FirefoxDriver.java:120)
at org.openqa.selenium.firefox.FirefoxDriver.<init>(FirefoxDriver.java:98)
at TesteAutomatizado.main(TesteAutomatizado.java:10)