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Hello,
In my project I have option payment throughout paytm gateway.For that I am using paytm standard checkout.
<a href = " https://developer.paytm.com/docs/v1/payment-gateway/"> https://developer.paytm.com/docs/v1/payment-gateway/</a>

My bnd.bnd

Bundle-ClassPath:\
.,\
libs/javax-crypto.jar,\

-includeresource:\
@PaytmChecksum.jar,\
@ibmjceprovider-1.jar,\
@cryptix32-3.2.0.jar,\
@bcprov-ext-jdk15to18-164.jar,\



My Gradle Properties :

compile fileTree(dir: &#039;libs&#047;&#039;, include: &#039;*.jar&#039;)
compileInclude name: &#039;paytm-checksum-1.1&#039;
compile name: &#039;cryptix32-3.2.0&#039;
compileInclude name: &#039;ibmjceprovider-1&#039;
compile name: &#039;bcprov-ext-jdk15to18-164&#039;
compileInclude name : &#034;bouncycastle-1.20&#034;

Code for generate checksum.
TreeMap<String,String> reqMap = new TreeMap<String,String>();
        reqMap.put("MID", "MID");
        reqMap.put("ORDER_ID", "ORD01");
        reqMap.put("CUST_ID","100");
        reqMap.put("TXN_AMOUNT", "1");
        reqMap.put("CHANNEL_ID", "CHANNEL_ID");
        reqMap.put("INDUSTRY_TYPE_ID", "INDUSTRY_TYPE_ID");
        reqMap.put("WEBSITE","DEFAULT");
        reqMap.put("MOBILE_NO", "1234567890");
        reqMap.put("EMAIL", "asdf@asdf.com");
        reqMap.put("CALLBACK_URL", "http://localhost:8080");
        String checkSum = getCheckSumPayTm(reqMap);
private static String getCheckSumPayTm(TreeMap<String, String> reqMap){
    
    CheckSumServiceHelper checkSumServiceHelper =  CheckSumServiceHelper.getCheckSumServiceHelper();
    String checksumSeed = "CHECKSUM_KEY";
    System.out.println("checksumseed : " + checksumSeed);
    String checksum = null;
    try {
        checksum =  checkSumServiceHelper.genrateCheckSum(checksumSeed, reqMap.toString());
        System.out.println("PAYTM CHECKSUM ================== "  + checksum);
    } catch (Exception e) {
        e.printStackTrace();
        System.out.println("error :" + e.getMessage());
    }
    return checksum;
    }
}

I am getting below class cast exception.

java.lang.ClassCastException: com.sun.crypto.provider.AESCipher$General cannot be cast to javax.crypto.CipherSpi
at javax.crypto.Cipher.getInstance(Cipher.java:286)
at com.paytm.pg.crypto.AesEncryption.encrypt(AesEncryption.java:19)
at com.paytm.pg.merchant.CheckSumServiceHelper.genrateCheckSum(CheckSumServiceHelper.java:425)
at com.ifl.payment.management.util.PaymentServiceUtil.getCheckSumPayTm(PaymentServiceUtil.java:317)
at com.ifl.payment.management.util.PaymentServiceUtil.getPayTMMesg(PaymentServiceUtil.java:271)
at com.ifl.payment.management.util.PaymentManagementUtil.onlinePaymentGateWay(PaymentManagementUtil.java:171)
at com.ifl.payment.management.web.PaymentManagementPortlet.gatewaySelectionForm(PaymentManagementPortlet.java:161)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.liferay.portal.kernel.portlet.LiferayPortlet.callActionMethod(LiferayPortlet.java:174)
at com.liferay.portal.kernel.portlet.bridges.mvc.MVCPortlet.callActionMethod(MVCPortlet.java:415)
at com.liferay.portal.kernel.portlet.LiferayPortlet.processAction(LiferayPortlet.java:88)
at com.liferay.portal.kernel.portlet.bridges.mvc.MVCPortlet.processAction(MVCPortlet.java:260)
at com.liferay.portlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:77)
at com.liferay.portal.kernel.portlet.PortletFilterUtil.doFilter(PortletFilterUtil.java:50)
at com.liferay.portal.kernel.servlet.PortletServlet.service(PortletServlet.java:115)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
at org.eclipse.equinox.http.servlet.internal.registration.EndpointRegistration.service(EndpointRegistration.java:153)
at org.eclipse.equinox.http.servlet.internal.servlet.ResponseStateHandler.processRequest(ResponseStateHandler.java:62)
at org.eclipse.equinox.http.servlet.internal.context.DispatchTargets.doDispatch(DispatchTargets.java:120)
at org.eclipse.equinox.http.servlet.internal.servlet.RequestDispatcherAdaptor.include(RequestDispatcherAdaptor.java:48)
at com.liferay.portlet.internal.InvokerPortletImpl.invoke(InvokerPortletImpl.java:589)
at com.liferay.portlet.internal.InvokerPortletImpl.invokeAction(InvokerPortletImpl.java:632)
at com.liferay.portlet.internal.InvokerPortletImpl.processAction(InvokerPortletImpl.java:304)
at com.liferay.portal.monitoring.internal.portlet.MonitoringInvokerPortlet.processAction(MonitoringInvokerPortlet.java:213)
at com.liferay.portlet.internal.PortletContainerImpl._processAction(PortletContainerImpl.java:521)
at com.liferay.portlet.internal.PortletContainerImpl.lambda$processAction$0(PortletContainerImpl.java:150)
at com.liferay.portlet.internal.PortletContainerImpl._preserveGroupIds(PortletContainerImpl.java:425)
at com.liferay.portlet.internal.PortletContainerImpl.processAction(PortletContainerImpl.java:143)
at com.liferay.portlet.SecurityPortletContainerWrapper.processAction(SecurityPortletContainerWrapper.java:93)
at com.liferay.portlet.RestrictPortletContainerWrapper.processAction(RestrictPortletContainerWrapper.java:76)
at com.liferay.portal.kernel.portlet.PortletContainerUtil.processAction(PortletContainerUtil.java:118)
at com.liferay.portal.action.LayoutAction.processLayout(LayoutAction.java:346)
at com.liferay.portal.action.LayoutAction.execute(LayoutAction.java:170)
at com.liferay.portal.struts.PortalRequestProcessor._process(PortalRequestProcessor.java:415)
at com.liferay.portal.struts.PortalRequestProcessor.process(PortalRequestProcessor.java:155)
at com.liferay.portal.internal.servlet.MainServlet.doPost(MainServlet.java:215)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:660)
at com.liferay.portal.internal.servlet.MainServlet.service(MainServlet.java:622)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:124)
at com.liferay.portal.servlet.filters.password.modified.PasswordModifiedFilter.processFilter(PasswordModifiedFilter.java:62)
at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:49)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:215)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:147)
at com.liferay.portal.servlet.filters.secure.BaseAuthFilter.processFilter(BaseAuthFilter.java:357)
at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:49)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:215)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:147)
at com.liferay.portal.monitoring.internal.servlet.filter.MonitoringFilter.processFilter(MonitoringFilter.java:182)
at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:49)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:215)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilter.doFilter(InvokerFilter.java:104)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:712)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:459)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:384)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:312)
at com.liferay.friendly.url.internal.servlet.FriendlyURLServlet.service(FriendlyURLServlet.java:409)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
at com.liferay.portal.servlet.ServletAdapter.service(ServletAdapter.java:99)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:124)
at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:147)
at com.liferay.portal.servlet.filters.i18n.I18nFilter.processFilter(I18nFilter.java:368)
at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:49)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:215)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
at com.liferay.portal.servlet.filters.password.modified.PasswordModifiedFilter.processFilter(PasswordModifiedFilter.java:62)
at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:49)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:215)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:147)
at com.liferay.portal.servlet.filters.secure.BaseAuthFilter.processFilter(BaseAuthFilter.java:357)
at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:49)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:215)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:147)
at com.liferay.portal.servlet.filters.etag.ETagFilter.processFilter(ETagFilter.java:87)
at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:49)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:215)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:147)
at com.liferay.portal.servlet.filters.autologin.AutoLoginFilter.processFilter(AutoLoginFilter.java:264)
at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:49)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:215)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:147)
at com.liferay.portal.sharepoint.SharepointFilter.processFilter(SharepointFilter.java:88)
at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:49)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:215)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:147)
at com.liferay.portal.servlet.filters.virtualhost.VirtualHostFilter.processFilter(VirtualHostFilter.java:268)
at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:49)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:215)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:147)
at com.liferay.portal.monitoring.internal.servlet.filter.MonitoringFilter.processFilter(MonitoringFilter.java:182)
at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:49)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:215)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDirectCallFilter(InvokerFilterChain.java:196)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:99)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDirectCallFilter(InvokerFilterChain.java:196)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:99)
at org.tuckey.web.filters.urlrewrite.RuleChain.handleRewrite(RuleChain.java:176)
at org.tuckey.web.filters.urlrewrite.RuleChain.doRules(RuleChain.java:145)
at org.tuckey.web.filters.urlrewrite.UrlRewriter.processRequest(UrlRewriter.java:92)
at org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:389)
at com.liferay.portal.servlet.filters.urlrewrite.UrlRewriteFilter.processFilter(UrlRewriteFilter.java:65)
at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:49)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:215)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDirectCallFilter(InvokerFilterChain.java:175)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:99)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDirectCallFilter(InvokerFilterChain.java:175)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:99)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDirectCallFilter(InvokerFilterChain.java:196)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:99)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilter.doFilter(InvokerFilter.java:104)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:200)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:834)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1415)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)
2020-03-27 06:39:32.059 ERROR [http-nio-8080-exec-3][PaymentServiceUtil:321] error :com.sun.crypto.provider.AESCipher$General cannot be cast to javax.crypto.CipherSpi