TestJDK1 Output

int 1
int 2
int 3
int 4
int 5

TestJdk1 Source

package com.talios.test;

import java.util.Arrays;
import java.util.List;

public class TestJdk {

    public static void main(String[] args) {

        List<String> strings = Arrays.asList("1", "2", "3", "4", "5");

        strings.stream()
               .mapToInt(s -> new Integer(s))
               .forEach(i -> System.out.println(String.format("int %d", i)));

    }

}

TestJDK2 Output

/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/bin/java -Didea.launcher.port=7535 -Didea.launcher.bin.path=/Applications/Cardea-IU-130.555.app/bin -Dfile.encoding=UTF-8 -classpath /Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/lib/ant-javafx.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/lib/dt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/lib/javafx-mx.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/lib/jconsole.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/lib/sa-jdi.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/lib/tools.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/jre/lib/charsets.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/jre/lib/deploy.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/jre/lib/htmlconverter.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/jre/lib/javaws.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/jre/lib/jce.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/jre/lib/jfr.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/jre/lib/JObjC.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/jre/lib/jsse.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/jre/lib/management-agent.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/jre/lib/plugin.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/jre/lib/resources.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/jre/lib/rt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/jre/lib/ext/cldrdata.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/jre/lib/ext/dnsns.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/jre/lib/ext/jfxrt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/jre/lib/ext/localedata.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/jre/lib/ext/nashorn.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/jre/lib/ext/sunec.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/jre/lib/ext/sunjce_provider.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/jre/lib/ext/sunpkcs11.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/jre/lib/ext/zipfs.jar:/Users/amrk/Dropbox/jdk8test/out/production/jdk8test:/Applications/Cardea-IU-130.555.app/lib/idea_rt.jar com.intellij.rt.execution.application.AppMain com.talios.test.TestJdk
Exception in thread "main" java.lang.BootstrapMethodError: call site initialization exception
  at java.lang.invoke.CallSite.makeSite(CallSite.java:298)
	at java.lang.invoke.MethodHandleNatives.linkCallSite(MethodHandleNatives.java:294)
	at com.talios.test.TestJdk.main(TestJdk.java:12)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:491)
	at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)
Caused by: java.lang.VerifyError: Bad type on operand stack
Exception Details:
  Location:
    com/talios/test/TestJdk$$Lambda$1.applyAsInt(Ljava/lang/Object;)I @11: ireturn
  Reason:
    Type 'java/lang/Integer' (current frame, stack[0]) is not assignable to integer
  Current Frame:
    bci: @11
    flags: { }
    locals: { 'com/talios/test/TestJdk$$Lambda$1', 'java/lang/Object' }
    stack: { 'java/lang/Integer' }
  Bytecode:
    0000000: bb00 0e59 2bc0 0010 b700 13ac          

	at java.lang.Class.getDeclaredConstructors0(Native Method)
	at java.lang.Class.privateGetDeclaredConstructors(Class.java:2536)
	at java.lang.Class.getDeclaredConstructors(Class.java:1928)
	at java.lang.invoke.InnerClassLambdaMetafactory$1.run(InnerClassLambdaMetafactory.java:147)
	at java.lang.invoke.InnerClassLambdaMetafactory$1.run(InnerClassLambdaMetafactory.java:144)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.lang.invoke.InnerClassLambdaMetafactory.buildCallSite(InnerClassLambdaMetafactory.java:143)
	at java.lang.invoke.LambdaMetafactory.metaFactory(LambdaMetafactory.java:191)
	at java.lang.invoke.CallSite.makeSite(CallSite.java:283)
	... 7 more

Process finished with exit code 1

TestJdk2 Source

package com.talios.test;

import java.util.Arrays;
import java.util.List;

public class TestJdk {

    public static void main(String[] args) {

        List<String> strings = Arrays.asList("1", "2", "3", "4", "5");

        strings.stream()
               .mapToInt(Integer::new)
               .forEach(i -> System.out.println(String.format("int %d", i)));

    }

}