java - Splitter blows up on simple Pattern

Question

I am just starting to us Guava in place of Google-Collections. The Splitter class seemed cool. But when I use it, like this:

private static final Pattern p = Pattern.compile(" +");
private static final Splitter usSplitter = Splitter.on(p).trimResults();

I get a stack dump:

java.lang.NoSuchMethodError: com.google.common.base.Platform.precomputeCharMatcher(Lcom/google/common/base/CharMatcher;)Lcom/google/common/base/CharMatcher;
        at com.google.common.base.CharMatcher.precomputed(CharMatcher.java:662)
        at com.google.common.base.CharMatcher.<clinit>(CharMatcher.java:69)
        at com.google.common.base.Splitter.<init>(Splitter.java:99)
        at com.google.common.base.Splitter.on(Splitter.java:208)

The javadocs have nothing about this "com.google.common.base.Platform." so its a bit hard to guess what is going wrong.

As you can see, the Pattern is dead simple.

Answer 1

The java.lang.NoSuchMethodError tells you that the desired method is missing in the current runtime classpath while it was there in the compile time classpath.

In other words, to fix this problem you need to align your runtime classpath to have the correct version of the API as you used during compile time. It can also be caused by having different versions of the library mixed throughout the runtime classpath. Cleanup the classpath then.