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Mikalai Zaikin

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since Jun 04, 2002
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Recent posts by Mikalai Zaikin

Congratuations, Dmitry !

Great score !  
Great score! Congratulations !  
2 weeks ago

Paul Anilprem wrote:I hope it is not a mistake in their FAQ because there was no OCA 6.



LOL, I also thought there was no OCA 6, but in fact it was:

Oracle Certified Associate, Java SE 5/SE 6 1Z0-850 Java SE 5 and 6, Certified Associate

(discontinued a year ago, btw)
Hi Scott !
I wonder what sort of questions were about Modules topic.
Are they only technical ones, with code snippets?
Because there is one objective "Describe the Modular JDK" - seems it's more theoretical.
check which user runs WAS process in OS
run "crontab -l" as that user
inspect if WAS stopped by cron
1 month ago
Summary of new topics/features
1) Modularity (from Java SE 9) and all related - migration, jdeps utility
2) Type inference (from Java SE 10) and as lambda parameters (from Java SE 11)
3) Annotations (applicable to older Java releases)
4) Security coding best practices (applicable to older Java releases)
Before the page renders there is noticeable delay (about 5 seconds), so it waits a bit something, then renders with stacktrace

Devaka Cooray wrote:Have a cow for reporting this. Can you please tell us what you were doing when this happened? What page / forum / category were you in?



It happens when I click top forums link https://coderanch.com/forums

Screenshot attached
JFYI: I am getting some stack trace today like this:


Latest in recent forums as sortable table
FreeMarker template error (DEBUG mode; use RETHROW in production!): For "." left-hand operand: Expected a hash, but this has evaluated to a string (wrapper: f.t.SimpleScalar): ==> lpi [in template "default/betaview/custom-widgets/widget-latest-in-sortable-forum.ftl" at line 89, column 31] ---- FTL stack trace ("~" means nesting-related): - Failed at: #assign postsPerPage = lpi.getNumberO... [in template "default/betaview/custom-widgets/widget-latest-in-sortable-forum.ftl" at line 89, column 7] - Reached through: #include "custom-widgets/${customView... [in template "default/betaview/homepage.ftl" at line 58, column 21] ---- Java stack trace (for programmers): ---- freemarker.core.NonHashException: [... Exception message was already printed; see it above ...] at freemarker.core.Dot._eval(Dot.java:45) at freemarker.core.Expression.eval(Expression.java:78) at freemarker.core.MethodCall._eval(MethodCall.java:55) at freemarker.core.Expression.eval(Expression.java:78) at freemarker.core.Assignment.accept(Assignment.java:131) at freemarker.core.Environment.visit(Environment.java:324) at freemarker.core.MixedContent.accept(MixedContent.java:54) at freemarker.core.Environment.visitByHiddingParent(Environment.java:345) at freemarker.core.IteratorBlock$IterationContext.executeNestedBlockInner(IteratorBlock.java:240) at freemarker.core.IteratorBlock$IterationContext.executeNestedBlock(IteratorBlock.java:220) at freemarker.core.IteratorBlock$IterationContext.accept(IteratorBlock.java:194) at freemarker.core.Environment.visitIteratorBlock(Environment.java:572) at freemarker.core.IteratorBlock.acceptWithResult(IteratorBlock.java:78) at freemarker.core.IteratorBlock.accept(IteratorBlock.java:64) at freemarker.core.Environment.visit(Environment.java:324) at freemarker.core.MixedContent.accept(MixedContent.java:54) at freemarker.core.Environment.visitByHiddingParent(Environment.java:345) at freemarker.core.ConditionalBlock.accept(ConditionalBlock.java:48) at freemarker.core.Environment.visitByHiddingParent(Environment.java:345) at freemarker.core.IteratorBlock$IterationContext.executeNestedBlockInner(IteratorBlock.java:240) at freemarker.core.IteratorBlock$IterationContext.executeNestedBlock(IteratorBlock.java:220) at freemarker.core.IteratorBlock$IterationContext.accept(IteratorBlock.java:194) at freemarker.core.Environment.visitIteratorBlock(Environment.java:572) at freemarker.core.IteratorBlock.acceptWithResult(IteratorBlock.java:78) at freemarker.core.IteratorBlock.accept(IteratorBlock.java:64) at freemarker.core.Environment.visit(Environment.java:324) at freemarker.core.MixedContent.accept(MixedContent.java:54) at freemarker.core.Environment.visit(Environment.java:324) at freemarker.core.Environment.include(Environment.java:2072) at freemarker.core.Include.accept(Include.java:167) at freemarker.core.Environment.visit(Environment.java:324) at freemarker.core.MixedContent.accept(MixedContent.java:54) at freemarker.core.Environment.visitByHiddingParent(Environment.java:345) at freemarker.core.ConditionalBlock.accept(ConditionalBlock.java:48) at freemarker.core.Environment.visit(Environment.java:324) at freemarker.core.MixedContent.accept(MixedContent.java:54) at freemarker.core.Environment.visitByHiddingParent(Environment.java:345) at freemarker.core.Environment.visitAndTransform(Environment.java:425) at freemarker.core.CompressedBlock.accept(CompressedBlock.java:37) at freemarker.core.Environment.visit(Environment.java:324) at freemarker.core.MixedContent.accept(MixedContent.java:54) at freemarker.core.Environment.visit(Environment.java:324) at freemarker.core.Environment.process(Environment.java:302) at freemarker.template.Template.process(Template.java:325) at net.jforum.JForum.processCommand(JForum.java:351) at net.jforum.JForum.service(JForum.java:300) at javax.servlet.http.HttpServlet.service(HttpServlet.java:727) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at com.javaranch.jforum.url.JSessionIDFilter.doFilter(JSessionIDFilter.java:27) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at com.javaranch.jforum.url.UrlFilter.doChain(UrlFilter.java:69) at com.javaranch.jforum.url.UrlFilter.doFilter(UrlFilter.java:52) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at net.jforum.util.legacy.clickstream.ClickstreamFilter.doFilter(ClickstreamFilter.java:55) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at net.jforum.JpaFilter.executeFilter(JpaFilter.java:59) at net.jforum.JpaFilter.doFilter(JpaFilter.java:48) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at com.javaranch.jforum.csrf.CsrfFilter.doFilter(CsrfFilter.java:105) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at net.jforum.JForumExecutionContextFilter.doFilter(JForumExecutionContextFilter.java:36) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at net.jforum.UrlMultiSlashFilter.doFilter(UrlMultiSlashFilter.java:27) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at net.jforum.JForumRequestCharacterEncodingFilter.doFilter(JForumRequestCharacterEncodingFilter.java:29) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at net.jforum.AccessBanFilter.doFilter(AccessBanFilter.java:44) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607) at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$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)

Sorry I don't have anything more detailed than on the Oracle web site.
1 month ago
Some thoughts:
Java EE 6 is not wide mainstream now, but some knowledge might still be useful. Example (IMHO): Servlet API, JPA.
Java EE 7 exam - extremely difficult, I took it only because passed all (except JSF) Java EE 6 exams earlier, and it helped a lot.
There is some exam about Java EE from RedHat, consider it as option.
OCM (architect) does not have any pre-requisite to take some exam. Not sure when OCM exam updated, but suspect it valid against Java EE 6.
If your aim is OCM - I would recommend reading books recommended here, do not bother with Java EE 7 exam, and proceed to OCM directly.
Hi Salah,

This information unfortunately does not present in score report, see full first page screenshot from CertView.
1 month ago

Praveen john wrote:Thanks for your response Mikalai Zaikin. I called and checked again and Oracle support team confirmed I can take up the exam and take the training later. I just took the exam today and cleared it.



Excellent ! Congratulations !

mallireddy thippareddy wrote:I have placed an order for OCP voucher at oracle university for which payment has been made. It's been 4 days my card was debited with the amount but, still I haven't received any confirmation mail or voucher yet. For OCA I received voucher and confirmation in 1 day after placing the order. Did anyone faced this issue?



*Just a guess*, maybe check junk mail folder?

I had some weird delay with Oracle when waited exam results. It took several days (maybe 3) to update certview, while they state exam results are ready in hour or so..