我跟随在我的64位x86,Ubuntu18.04系统上安装了Java。
当我运行"java -version“时,我得到了输出:
ariba@monster:~$ java -version
java version "1.8.0_231"
Java(TM) SE Runtime Environment (build 1.8.0_231-b11)
Java HotSpot(TM) Server VM (build 25.231-b11, mixed mode)
"Java HotSpot(TM) Server VM (build 25.231-b11,混合模式)
我正在研究Java语言规范17.4中的Java内存模型,我想通过测试因果关系来理解java内存模型。我在.I实现测试用例1中找到了一组因果关系,如下所示:
@JCStressTest
@State
public class CausalityTestCase1 {
int x = 0;
int y = 0;
@Actor
public void actor1(IntResult2 r) {
r.r1 = x;
if (r.r1 >= 0) {
y = 1;
}
}
有人告诉我,volatile关键字可能会在变量的写操作之前增加内存屏障。所以我写了代码:
public class Test {
private Object o;
public Test() {
this.o = new Object();
}
private volatile static Test t;
public static void createInstance() {
t = new Test(); // volatile would insert memory barrier
当我启动一个cassandra实例时,我得到了一个错误。你知道我怎么能修好它吗?
primecast-cassandra_1 | org.apache.cassandra.db.commitlog.CommitLogReadHandler$CommitLogReadException: Unexpected error deserializing mutation; saved to /tmp/mutation6385168154232968395dat. This may be caused by replaying a mutation against a tabl
当我使用我的TestRunner类(我的@CucumberOptions,glue和标签所在的类)运行我的黄瓜测试套件时,我得到了这个错误:
org.testng.TestNGException:
TestNG by default disables loading DTD from unsecured Urls. If you need to explicitly load the DTD from a http url, please do so by using the JVM argument [-Dtestng.dtd.http=true]
at org.testng.xm
我建立了基于DbUnit测试框架(内存中的H2数据库)的持久性层测试,这些测试非常有效,但是当我想切换到Oracle时,我有以下错误:
org.dbunit.database.AmbiguousTableNameException: AQ$_SCHEDULES
at org.dbunit.dataset.OrderedTableNameMap.add(OrderedTableNameMap.java:198)
at org.dbunit.database.DatabaseDataSet.initialize(DatabaseDataSet.java:231)
at org.dbunit.da
在一些负载测试中,在某些情况下,我有:
session with status Status{code=CANCELLED, description=Failed to read message., cause=io.grpc.StatusRuntimeException: INTERNAL: Invalid protobuf byte sequence
at io.grpc.Status.asRuntimeException(Status.java:526)
at io.grpc.protobuf.lite.ProtoLiteUtils$MessageMarshaller
我正在尝试使用带有自定义绑定的Maven XJC插件从一组XSD文件生成Java类。该自定义将添加到中。然而,当maven构建运行时,XJC插件似乎无法识别schemaBindings元素并抛出异常。
[ERROR] Error while parsing schema(s).Location [ file:/C:/blah/bindings.xjb{5,25}].
com.sun.istack.SAXParseException2: The "jaxb:schemaBindings" customization is no
t associated with any sche