java – How I can get all adresses from WIF personal key?

I exploit Java and bitcoinj. I’ve a personal key

String str="5HpHagT65TZzG1PH3CSu63k8DbpvD8s5ip4nEB3kEsreAnchuDf";

I attempt to get compress and decompress 2 adresses on this format:

1EHNa6Q4Jz2uvNExL497mE43ikXhwF6kZm  1BgGZ9tcN4rm9KBzDn7KprQz87SZ26SAMH

I do step one, attempt get ECKey:

NetworkParameters params = MainNetParams.get();
      ECKey key;

      if (str.size() == 51 || str.size() == 52) {
          DumpedPrivateKey dumpedPrivateKey = DumpedPrivateKey.fromBase58(params, str);
          key = dumpedPrivateKey.getKey();            //ERROR
      } else {
          BigInteger privKey = Base58.decodeToBigInteger(str);
          key = ECKey.fromPrivate(privKey);
      }
.
.
.

and I get an exception:

Exception in thread "important" java.lang.IllegalArgumentException
   at com.google.widespread.base.Preconditions.checkArgument(Preconditions.java:128)
   at org.bitcoinj.core.ECKey.<init>(ECKey.java:195)
   at org.bitcoinj.core.ECKey.fromPrivate(ECKey.java:243)
   at org.bitcoinj.core.ECKey.fromPrivate(ECKey.java:259)
   at org.bitcoinj.core.DumpedPrivateKey.getKey(DumpedPrivateKey.java:101)
   at com.instance.demo2.controllers.AdressFromKey.important(AdressFromKey.java:35)

What am I doing flawed?