There seems to be a typo in the gradlew.bat script:
Lines 34 to 36 say this:
:findJavaFromJavaHome
set JAVA_HOME=%JAVA_HOME:"=%
set JAVA_EXE=%JAVA_HOME%/bin/java.exe
It seems that someone is trying to strip quote characters on this path string, which is not necessary.
set JAVA_HOME=%JAVA_HOME:"=%
I would suggest rewriting it like this, replacing backslashes in the path to java so that Jmeter wont have trouble loading it:
:findJavaFromJavaHome
set "JAVA_HOME=%JAVA_HOME:=/%"
set “JAVA_EXE=%JAVA_HOME%/bin/java.exe”
Or perhaps this would be better to resist this error: http://stackoverflow.com/questions/19550472/jmeter-2-10-http-recorder-throws-keytool-exception :
:findJavaFromJavaHome
set "JAVA_EXE=%JAVA_HOME%\bin\java.exe"
set “PATH=%JAVA_HOME%\bin;%PATH%”