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/* package whatever; // don't place package name! */
 
import java.util.*;
import java.util.function.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	static Foo foo;
 
	public static void main (String[] args) throws java.lang.Exception
	{
		System.out.println(testInt());
		System.out.println(testStr());
	}
 
	static int testInt() {
		return get(() -> foo.getInt(), "");
	}
 
	static String testStr() {
		return get(() -> foo.getInt(), "");
	}
 
	static class Foo {
		int getInt() {
			return 1;
		}
	}
 
	static <T> T get(Supplier<T> supplier, T defaultValue) {
	    try {
	        return supplier.get();
	    } catch (NullPointerException e) {
	        return defaultValue;
	    }
	}
}

Main.java:20: error: incompatible types: inferred type does not conform to upper bound(s)
		return get(() -> foo.getInt(), "");
		          ^
    inferred: INT#1
    upper bound(s): Integer,Object
  where INT#1,INT#2 are intersection types:
    INT#1 extends Object,Serializable,Comparable<? extends INT#2>,Constable,ConstantDesc
    INT#2 extends Object,Serializable,Comparable<?>,Constable,ConstantDesc
Main.java:24: error: incompatible types: inferred type does not conform to upper bound(s)
		return get(() -> foo.getInt(), "");
		          ^
    inferred: INT#1
    upper bound(s): String,Object
  where INT#1,INT#2 are intersection types:
    INT#1 extends Object,Serializable,Comparable<? extends INT#2>,Constable,ConstantDesc
    INT#2 extends Object,Serializable,Comparable<?>,Constable,ConstantDesc
2 errors

Standard output is empty