java.lang.NullPointerException: cannot unbox null value 这个错误通常发生在Java中将一个可能为null的对象自动拆箱(unboxing)为基本数据类型时。在Java中,基本数据类型(如int, float, boolean等)与它们的包装类(如Integer, Float, Boolean等)之间存在自动装箱(boxing)和拆箱(unboxing)的机制。如果尝试将一个null的...
然后断点,并且将这句话 add to watch 会出现真正的异常:java.lang.NullPointerException: cannot unbox null value 是因为拆箱的时候对象为空,所以拆箱报错,integer对象到int基本类型会自动拆箱。而integer为空,所以报错。
java.lang.NullPointerException:cannot unboxnullvalue 有线索了:难道是setInvoiceInfoId(?) step into[F7] 直接就报NPE了,无法step into!!! 这是Lombok的锅,这就是少写get、set方法的代价。此路不通 那就反编译下这个类PageQueryVO 排除法:那没谁了 ctrl+alt+v抽个变量出来看看: 你们看到了啥,看到了啥 ...
java.lang.NullPointerException: cannot unbox null value装箱拆箱引发的空指针异常 摘要:解决思路:首先根据报错定位到关键的一句话 list<charginPileVO>... 然后断点,并且将这句话 add to watch 会出现真正的异常:java.lang.NullPointerException: cannot unbox null value是因为拆箱的时候对象为空,所 阅读全文 ...
min(i,Integer.MAX_VALUE-(-low)-1);}catch(NumberFormatExceptionnfe){// If the property cannot ...
所以1000==1000未必是false。我知道这条八股文是想问box unbox和constant pool之类的，但是知道那些的...
int num = a; // 自动拆箱,会抛出 NullPointerException } catch (NullPointerException e) { System.out.println("Cannot unbox a null Integer."); } 1. 2. 3. 4. 5. 6. 总结 Java 中的Wrapper类在处理基本数据类型方面极大地提升了灵活性,特别是在集合、泛型等需要对象的场合。通过自动装箱和自动拆...
Improve boxing/unboxing unit tests and remove useless code in isUnbox... (PR #2984, by @jlerbsc) Bump jbehave-core from 4.7 to 4.8.1 (PR #2989, by @dependabot) Add JVM memory settings for surefire (seems that forked mode is the default running mode) (PR #2999, by @jlerbsc) Mo...
if/else, while, and do all are affected by Tiger’s ability to unbox Boolean values to boolean values. By now, this shouldn’t require much explanation: Boolean arriving = false; Boolean late = true; Integer peopleInRoom = 0; int maxCapacity = 100; boolean timeToLeave = false; while ...
Prerequisites Please answer the following questions for yourself before submitting an issue. I am running the latest version I checked the documentation and found no answer I checked to make sure that this issue has not already been file...