Java Building ERROR

[ray0728]

I cannot build this code in NetBeans. the error infomation is:

net/automatalib/graphs/IndefiniteGraph.java:[45,25] method transform in class com.google.common.collect.Iterators cannot be applied to given types;
  required: java.util.Iterator<F>,com.google.common.base.Function<? super F,? extends T>
  found: java.util.Iterator<E>,this::getTarget
  reason: cannot infer type-variable(s) F,T
    (argument mismatch; invalid method reference
      incompatible types: ? super F cannot be converted to E)
1 error
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BUILD FAILURE
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How can I fix it?

[mtf90]

Could you provide some additional information about your environment?

• Are you trying to build AutomataLib directly (i.e. you only have AutomataLib imported as a project) or do you use AutomataLib in another project (with a possibly conflicting Guava version?)
• Which Java version are you using?
• Which NetBeans version are you using?

I'll try and see, if I can reproduce this issue with NetBeans.

[ray0728]

I am using Netbeans 8.2 with JDK 1.8.0_20-b26. and without GUAVA. I build this AutomataLib as a Maven project directly. btw: I was downloaded master branch code only. should I build AutomataLib with GUAVA or use other branch code?

[mtf90]

I tried to reproduce your error, but wasn't able to do so. I assume you just imported AutomataLib as a Maven project and then did 'Right click' > Build, right?

I noticed, that NetBeans by default uses a bundled Maven version (3.0.5) which seems to be too old. I needed to manually select my system installation (3.5.2). Also your JDK version seems rather old. My system installation is an OpenJDK 1.8.0_162-b12, the CI servers use 1.8.0_141-b15 (OpenJDK) and 1.8.0_151-b12 (OracleJDK). You could try to update your JDK to see if the errors persist.

May I ask, why you want to build AutomataLib? The code on the master branch is deployed to the Maven Central Repository. And recently, we have also set up continous deployment for development versions (see here) . So you can just declare a Maven dependency wherever you want to use AutomataLib. Unless you want to actively develop on AutomataLib, there is practically no need to build it yourself.

[ray0728]

it's work now, after I update my JDK to the newest. thank you so much for your help. I wanna test my program with learnlib, but I cannot download learnlib and automatalib directly from maven repository. so I have to build it by myself