Is that a case for a lot of people or is it just that I'm having a really hard time? At the moment, I'm doing the big Dungeon exercise in Week 10 (33) and even though I started on my own, I just hit the wall and had to look at solution which was way different than what I started.
I am trying to run a jar file which gives 'out of memory error' after running some time. I have searched sometimes about using Hard Disk space as java heap, but most of the solutions suggest optimizing code or using something like 'Ehcache'. But the problem is, I have only the jar file and I did not write its code. So, my question is Can I use some mechanism, or software, by which I can make java use the hard disk space as heap, without modifying the code of the jar file in any way?
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Having said that, it should be noted that the JVM (In particular, the Oracle JVM) provides some configurability in terms of how much heap memory you want it to use to run your Java app. The single most important configuration parameter is -Xmx, the so-called "Maximum Heap Memory". When you specify this parameter, like e.g. -Xmx6g, the JVM, at the startup, will ask the Operating System (on which the JVM runs) for that much of memory. The exact details are a bit complicated, but if that amount of memory is not available at the startup, the JVM startup fails. There is complicated algorithm to determine the default value for this heap memory but if you have requirements, you should override the default like above. In the above case, your JVM (java -Xmx6g -jar test.jar) is asking for 6 GB of heap to start with.
This happy path, however, is not always possible in that enough RAM is not available. Even then, the OS can grant the request because of this OS concept called the Virtual Memory. Without going into too many details (you can read up on virtual memory), it would suffice to say that OS has a mechanism where it can use the hard disk space as RAM via the mechanism of page swapping. In other words, it can swap the data into physical RAM or swap data out to hard disk in a way that is transparent to all the processes running on it (including the JVM, which is nothing but a process named java).
As for hard links, when you create a hard link ln you make a sort of a copy of the original file preserving all its properties (it has the same inode as the original file). Thus the working directory will be the one where the hard link is located. So in your case, the hard link works fine but it uses /usr/bin as its working dir & looks for other supplementary files in this folder.
I've been on and off about it, really have. I want to mod but I don't at the same time because I fear I wont have a life anymore. I'm also about to be learning other programs (Going to college for this, but not to learn java.) so I don't want something to complicated now. Yes i've seen the how to make a simple block videos but they don't tell you much, I'm more interested in the type of things that make power transport possible, ruins and tornadoes.
The hardest part is going to be the creative side of things. Textures, sounds, what your mod does specifically, etc. The actual coding, once you've learned the language, is really as simple as the proverbial "insert slot A into tab B" stuff found in assembly instructions for anything that has to be put together.
You will have to learn Java one way or another if you want to get into modding. You can of course follow templates that videos and guides provide but that can only get you so far, to really do interesting stuff you need to learn how to code properly. Java isn't all too hard to pick up if you have some experience with coding, if not it's not too difficult either once you wrap your head around the concepts.
FWIW, I learned programming the hard way with the C language. I've been bitten so many times by undefined behavior and incomprehensible Heisenbugs that Rust was easily sold to me when I actually looked into the language goals. That's a very different perspective from the other languages mentioned; As long as you have a ton of memory, you're probably not going to have too many complaints with the language.
Languages like Rust, C, and C++ have different objectives than languages that take away most of your abilities to control memory usage like C#, Java, and Javascript. In these GC'd languages, there is very little use of the stack and practically everything you create goes on the heap with little control over where that ends up in memory. In addition to the nasty impact of a GC, you have to work hard in these languages to put your data in contiguous memory if you are concerned about performance. That means you are using the hardware pretty ineffectively. If the problem you are solving has CPU to spare and the speed to execute a task or cost of hardware is not a concern, you can use these "easier" languages and solve your issue at a high level without thinking about memory. But if you are trying to max out your performance, you need to think about your memory usage and layout. And Rust really shines with its borrow checker checking every one of your memory model assumptions. I think if you focus on how memory is laid out when your code is running, the L1, L2, L3 processor caches, and the likely cost of running your code, you will start to appreciate what Rust is doing for you.
Hey there,
may be you could also consider, when coming from Java, to take a look at Scala fist. It introduces all the functional programming style and takes you away from OO programming thinking while still working mainly with a Java Syntax as it finally transpires to Java Code. From Scala than the step to Rust (which I personally favor over Scala) does not feel that hard then
If one has never dealt with details of how natively-compiled code works under the hood, and is used to everything being a magic implicit reference type with a runtime always (supposedly) doing the right thing, then they'll have a hard time peeling off all the nice abstractions Rust provides over these gory details.
I have followed the steps to create a maven project with the archetype from this page Now I want to make changes following this page The java files from the second link are for a Maven project or this is a different approach?
We have 4 teams, each team has to do a module of the final application. We want to do in xwiki the frontend part (velocity, html, javascript) and the work with classes and objects in java. Now, all I want is to create a simple app like the basic project from the 2nd link just to see how it works.
I have a java app that accesses an NFS share with hard mount (soft mount does troubles i get many RPC timeout's for some reason).I'm on solaris.If i turn off (svcadm -v disable to the nfs server) then my java app gets stuckif doing
returns nothing as my java process hangs - strange, why even kill -3 to get thread dump does not return?also i even had problems killing my process - its not something i want to do, i don't want my app to get stuck if the mount is downAnyone has a solution or can recommend what I should be doing?I would like to use maybe soft mounts the problem is that i get many RPC timeout while I try to copy files from one server to an nfs share.
Blocking-and-retrying-indefinitely is the very definition of a hard-mount. Passing the intr option to the mount command ought to at least allow you to interrupt the blockage when the mount is down, if I'm reading the docs correctly.
Proof that the hard tag doesn't necessarily encompass the hardest problems, Word Search has proved a tricky ask for 6 out of 10 coders. Operating more like boggle than a traditional word search, the program checks if a word can be made by sequentially adding characters from the grid where each cell is horizontally or vertically adjacent.
One of the hardest you're likely to come across is the dynamic programming challenge of regular expression matching. It asks that you run through a string with an input pattern to see if that pattern is matches. So, for example the string AA would not match the pattern A as it is not a complete match.
Today I decided I would finally backup all my files from my external hard drive to my actual PC. I selected all folders from my hard drive and dragged them to a folder in the desktop (essentially just copying). I let it sit in the "Discovering Files" state for a long time since its a lot of folders making up 100+ gigs. But, the "copying" process ends there (on the Discovering X files state). So, I tried dragging folders one at a time. To my surprise, most did copy, but some didn't. After hours of googling, I looked at the folders (that weren't copying), and realized those folders were the ones containing Java code. The 2 folders that weren't copying were my "Minecraft" folder (which I use to make spigot plugins), and my "Java" folder, which I use to put all my small programs in. e24fc04721
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