Problem seems to be in bundled JRE. I modified soapui-pro.bat to use JDK installed on my PC and now it works...
soapui-pro.bat after modification:
@echo off
set SOAPUI_HOME=%~dp0
set JAVA_HOME=c:\Program Files\Java\jdk1.7.0_40\bin
rem if exist "%SOAPUI_HOME%..\jre\bin" goto SET_BUNDLED_JAVA
if exist "%JAVA_HOME%" goto SET_SYSTEM_JAVA
echo JAVA_HOME is not set, unexpected results may occur.
echo Set JAVA_HOME to the directory of your local JDK to avoid this message.
goto SET_SYSTEM_JAVA
:SET_BUNDLED_JAVA
set JAVA=%SOAPUI_HOME%..\jre\bin\java
goto END_SETTING_JAVA
:SET_SYSTEM_JAVA
set JAVA=java
:END_SETTING_JAVA
rem init classpath
set OLDDIR=%CD%
cd /d %SOAPUI_HOME%
set CLASSPATH=%SOAPUI_HOME%soapui-pro-5.0.0.jar;%SOAPUI_HOME%..\lib\*
"%JAVA%" -cp "%CLASSPATH%" com.eviware.soapui.tools.JfxrtLocator > %TEMP%\jfxrtpath set /P JFXRTPATH= < %TEMP%\jfxrtpath del %TEMP%\jfxrtpath set CLASSPATH=%CLASSPATH%;%JFXRTPATH%
rem JVM parameters, modify as appropriate set JAVA_OPTS=-Xms128m -Xmx1024m -Dsoapui.properties=soapui.properties -
Dgroovy.source.encoding=iso-8859-1 "-Dsoapui.home=%SOAPUI_HOME%\" -splash:soapui-pro-
splash.png
if "%SOAPUI_HOME%" == "" goto START
set JAVA_OPTS=%JAVA_OPTS% -Dsoapui.ext.libraries="%SOAPUI_HOME%ext"
set JAVA_OPTS=%JAVA_OPTS% -Dsoapui.ext.listeners="%SOAPUI_HOME%listeners"
set JAVA_OPTS=%JAVA_OPTS% -Dsoapui.ext.actions="%SOAPUI_HOME%actions"
set JAVA_OPTS=%JAVA_OPTS% -Djava.library.path="%SOAPUI_HOME%\"
set JAVA_OPTS=%JAVA_OPTS% -Dwsi.dir="%SOAPUI_HOME%..\wsi-test-tools"
rem uncomment to disable browser component
rem set JAVA_OPTS=%JAVA_OPTS% -Dsoapui.browser.disabled="true"
:START
rem ********* run soapui ***********
"%JAVA%" %JAVA_OPTS% -cp "%CLASSPATH%" com.eviware.soapui.SoapUIPro %* cd /d %OLDDIR%
