jvm

问题 This is the code of selenium code to open the chrome browser and closing it. import org.openqa.selenium.WebDriver; import org.openqa.selenium.chrome.ChromeDriver; import org.openqa.selenium.By; public class TC001_Login_Logout { public static void main(String args[]) throws Exception { System.setProperty("webdriver.chrome.driver", "C:\\Eclipse\\Selenium\\chrome"); WebDriver driver = new ChromeDriver(); driver.get("http://127.0.0.1/orangehrm-2.6/login.php"); System.out.println("Application

问题 I thought I've always understood why Java was portable, until I took Computer Organization. This is my interpretation of a C program from start to finish: C program --> compiler --> assembly --> machine code --> ISA --> micro architecture (how the computer interprets ISA) --> logic gate --> circuit --> device Where the compiler must have knowledge of the ISA. Also, the assembly and machine code will vary based on ISA. Java is as such: (inside JVM): Java program --> compiler --> bytecode

问题 I'm trying to start a new jvm with the command: java -version , but it report a error: # There is insufficient memory for the Java Runtime Environment to continue. # Native memory allocation (malloc) failed to allocate 160088 bytes for AllocateHeap # An error report file with more information is saved as: # /users/xxx/xxx/hs_err_pid12365.log Then I checked file /users/xxx/xxx/hs_err_pid12365.log , and I find out it say: # Native memory allocation (malloc) failed to allocate 295856 bytes for

问题 While playing with some jcstress code, I noticed two parameters that are very new to me: StressLCM and StressGCM . The very first thing to do for me was searching for these in the source code itself and while I have found some things, it is still unclear what they actually do. I was really hoping to see some comments in the source code that would shed some light, but no luck. I also found the bug description where these have been added, but the explanation made no sense for me: Randomize

问题 We are going through a problem probably related to Jacob 1.14.3 dll when being used inside a Virtual Machine. When running our automation script from the jenkins pipeline inside our windows server VMs (master/slaves) the following error is shown in the logs: A fatal error has been detected by the Java Runtime Environment: EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x0000000180012df1, pid=6404, tid=0x00000000000017bc JRE version: Java(TM) SE Runtime Environment (8.0_271-b09) (build 1.8.0

问题 My question is as the title, and I got some knowledge by searching: linux has shared memory How to measure actual memory usage of an application or process? JVM will reserve the amount of memory setted in Xms What does the -Xms JVM mean in reference to heap memory? But still don't know why, some on can offer some help? Here is my test run on Ubuntu12.04(64bit) | JDK 1.7.0_04. and top shows below: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 4067 brian 20 0 5316m **262m** 7496 S 0 3.3

问题 This is Kotlin/JVM I currently have this code : fun String.isValidInt(): Boolean { var isInt: Boolean = false try { if (this.toInt().toString() == this) { isInt = true } } catch (e: NumberFormatException) { isInt = false } return isInt } and I was wondering if there was a more elegant way to approach this, specficially the way I set the return value isInt to true or false. Here is a playground link to my code and a main function to test with. 回答1: For a start, try can return an expression.

问题 We have written JMH custom bench marking to our test cases, expected inputs we are reading from properties file. For each iteration we read input from properties file then we execute our actual logic, we are capturing time in milliseconds before and after execution of our logic. While starting the test case we pass number of iterations as argument, until 2000 iterations it is working fine. If we give iteration number more than 2000 then we are getting below error. A fatal error has been

问题 I had expected that the Java Virtual Machine would use a simple lookup table for normal method invocations: The object contains a pointer to a lookup table with the addresses for all methods that the class implements (including the methods implemented by super-classes). A specific method is simply represented by an index into that table. The JVM looks up the address of the method in the table, and jumps to that address. But the JVM specification specifies a long and complex procedure for

问题 JVM Crash - "EXCEPTION_ACCESS_VIOLATION" I made this CLI tool using Spring Boot and it takes a long time to run. I usually let it run overnight. Then, for several times I came across this JVM crash, and I don't know what to look for in there. I have seen other error reports on SO, but could not relate those to mine. Can you please take a look at this log file? Bear in mind I have been having problems with memory leak in the app... I have started suffering from this error when I thought I had