gcj错误 - 无法找到类java.util.function.Predicate的文件

时间：2018-04-30 13:34:11

标签： java compiler-errors guava machine-code gcj

我有一个java代码，我必须使用guava23.0.jar作为外部库。 更具体地说，我需要进行这些导入：

import com.google.common.base.Charsets;
import com.google.common.hash.BloomFilter;
import com.google.common.hash.Funnel;
import com.google.common.hash.PrimitiveSink;

我构建了我的代码的jar文件，现在，我尝试使用gcj生成机器代码。 我测试了jar文件，它运行得很好，并给我输出。 但是，当尝试使用gcj编译和生成机器代码时，它会给我带来几个错误：

com/google/common/base/Predicate.java:0:0: error: cannot find file for class java.util.function.Predicate
com/google/common/base/Predicate.java: At top level:
com/google/common/base/Predicate.java:0:0: error: cannot find file for class java.util.function.Predicate
com/google/common/base/Predicate.java:0:0: error: cannot find file for class java.util.function.Predicate
com/google/common/base/Supplier.java: In class 'com.google.common.base.Absent':
com/google/common/base/Supplier.java: In method 'com.google.common.base.Absent.or(com.google.common.base.Supplier)':
In file included from com/google/common/base/Absent.java:60:0,
                 from com/google/common/annotations/VisibleForTesting.java:2,
                 from com/google/common/annotations/GwtIncompatible.java:1,
                 from com/google/common/annotations/GwtCompatible.java:1,
                 from com/google/common/annotations/Beta.java:1,
                 from bloomfilter/MultipleBloomFilterCheck.java:41,
                 from bloomfilter/MultipleBloomFilterCheck.java:100,
                 from bloomfilter/Main.java:25,
                 from <built-in>:3:
com/google/common/base/Supplier.java:0:0: error: cannot find file for class java.util.function.Supplier
In file included from com/google/common/annotations/VisibleForTesting.java:2:0,
                 from com/google/common/annotations/GwtIncompatible.java:1,
                 from com/google/common/annotations/GwtCompatible.java:1,
                 from com/google/common/annotations/Beta.java:1,
                 from bloomfilter/MultipleBloomFilterCheck.java:41,
                 from bloomfilter/MultipleBloomFilterCheck.java:100,
                 from bloomfilter/Main.java:25,
                 from <built-in>:3:
com/google/common/base/Absent.java:60:0: error: cannot find file for class java.util.function.Supplier
com/google/common/base/Absent.java:60:0: error: cannot find file for class java.util.function.Supplier
com/google/common/base/Absent.java:60:0: error: cannot find file for class java.util.function.Supplier
com/google/common/base/Function.java: At top level:
In file included from com/google/common/base/Ascii.java:636:0,
                 from com/google/common/base/AbstractIterator.java:89,
                 from com/google/common/base/AbstractIterator.java:35,
                 from com/google/common/base/AbstractIterator.java:60,
                 from com/google/common/base/Absent.java:27,
                 from com/google/common/annotations/VisibleForTesting.java:2,
                 from com/google/common/annotations/GwtIncompatible.java:1,
                 from com/google/common/annotations/GwtCompatible.java:1,
                 from com/google/common/annotations/Beta.java:1,
                 from bloomfilter/MultipleBloomFilterCheck.java:41,
                 from bloomfilter/MultipleBloomFilterCheck.java:100,
                 from bloomfilter/Main.java:25,
                 from <built-in>:3:
com/google/common/base/Function.java:0:0: error: cannot find file for class java.util.function.Function
In file included from com/google/common/base/Ascii.java:634:0,
                 from com/google/common/base/AbstractIterator.java:89,
                 from com/google/common/base/AbstractIterator.java:35,
                 from com/google/common/base/AbstractIterator.java:60,
                 from com/google/common/base/Absent.java:27,
                 from com/google/common/annotations/VisibleForTesting.java:2,
                 from com/google/common/annotations/GwtIncompatible.java:1,
                 from com/google/common/annotations/GwtCompatible.java:1,
                 from com/google/common/annotations/Beta.java:1,
                 from bloomfilter/MultipleBloomFilterCheck.java:41,
                 from bloomfilter/MultipleBloomFilterCheck.java:100,
                 from bloomfilter/Main.java:25,
                 from <built-in>:3:
com/google/common/base/CaseFormat.java:0:0: error: cannot find file for class java.util.function.Function
com/google/common/base/CaseFormat.java:0:0: error: cannot find file for class java.util.function.Function
com/google/common/base/CaseFormat.java:0:0: error: cannot find file for class java.util.function.Function
com/google/common/base/CaseFormat.java:0:0: error: cannot find file for class java.util.function.Function
com/google/common/base/CaseFormat.java:0:0: error: cannot find file for class java.util.function.Function
com/google/common/base/CaseFormat.java:0:0: error: cannot find file for class java.util.function.Function
In file included from com/google/common/base/Ascii.java:640:0,
                 from com/google/common/base/AbstractIterator.java:89,
                 from com/google/common/base/AbstractIterator.java:35,
                 from com/google/common/base/AbstractIterator.java:60,
                 from com/google/common/base/Absent.java:27,
                 from com/google/common/annotations/VisibleForTesting.java:2,
                 from com/google/common/annotations/GwtIncompatible.java:1,
                 from com/google/common/annotations/GwtCompatible.java:1,
                 from com/google/common/annotations/Beta.java:1,
                 from bloomfilter/MultipleBloomFilterCheck.java:41,
                 from bloomfilter/MultipleBloomFilterCheck.java:100,
                 from bloomfilter/Main.java:25,
                 from <built-in>:3:
com/google/common/base/Converter.java:0:0: error: cannot find file for class java.util.function.Function
com/google/common/base/Converter.java:0:0: error: cannot find file for class java.util.function.Function
com/google/common/base/CaseFormat.java: In class 'com.google.common.base.CaseFormat':
com/google/common/base/CaseFormat.java: In method 'com.google.common.base.CaseFormat.convert(com.google.common.base.CaseFormat,java.lang.String)':
In file included from com/google/common/base/CaseFormat.java:155:0,
                 from com/google/common/base/CaseFormat.java:101,
                 from com/google/common/base/CaseFormat.java:82,
                 from com/google/common/base/CaseFormat.java:74,
                 from com/google/common/base/CaseFormat.java:66,
                 from com/google/common/base/CaseFormat.java:47,
                 from com/google/common/base/Ascii.java:641,
                 from com/google/common/base/AbstractIterator.java:89,
                 from com/google/common/base/AbstractIterator.java:35,
                 from com/google/common/base/AbstractIterator.java:60,
                 from com/google/common/base/Absent.java:27,
                 from com/google/common/annotations/VisibleForTesting.java:2,
                 from com/google/common/annotations/GwtIncompatible.java:1,
                 from com/google/common/annotations/GwtCompatible.java:1,
                 from com/google/common/annotations/Beta.java:1,
                 from bloomfilter/MultipleBloomFilterCheck.java:41,
                 from bloomfilter/MultipleBloomFilterCheck.java:100,
                 from bloomfilter/Main.java:25,
                 from <built-in>:3:
com/google/common/base/CaseFormat.java:130:0: error: cannot find file for class java.util.function.Predicate
com/google/common/base/CaseFormat.java:130:0: error: cannot find file for class java.util.function.Predicate
com/google/common/base/CharMatcher.java: In class 'com.google.common.base.CharMatcher$And':
com/google/common/base/CharMatcher.java: In method 'negate()':
In file included from com/google/common/base/CharMatcher.java:616:0,
                 from com/google/common/base/CaseFormat.java:30,
                 from com/google/common/base/CaseFormat.java:155,
                 from com/google/common/base/CaseFormat.java:101,
                 from com/google/common/base/CaseFormat.java:82,
                 from com/google/common/base/CaseFormat.java:74,
                 from com/google/common/base/CaseFormat.java:66,
                 from com/google/common/base/CaseFormat.java:47,
                 from com/google/common/base/Ascii.java:641,
                 from com/google/common/base/AbstractIterator.java:89,
                 from com/google/common/base/AbstractIterator.java:35,
                 from com/google/common/base/AbstractIterator.java:60,
                 from com/google/common/base/Absent.java:27,
                 from com/google/common/annotations/VisibleForTesting.java:2,
                 from com/google/common/annotations/GwtIncompatible.java:1,
                 from com/google/common/annotations/GwtCompatible.java:1,
                 from com/google/common/annotations/Beta.java:1,
                 from bloomfilter/MultipleBloomFilterCheck.java:41,
                 from bloomfilter/MultipleBloomFilterCheck.java:100,
                 from bloomfilter/Main.java:25,
                 from <built-in>:3:
com/google/common/base/CharMatcher.java:1719:0: error: cannot find file for class java.util.function.Predicate
com/google/common/base/CharMatcher.java:1719: confused by earlier errors, bailing out

我的其他代码中没有这些错误，包括其他一些外部罐子而不是番石榴！

1 个答案:

答案 0 :(得分：3)

我假设你在谈论作为GCC编译器套件一部分的GCJ Java编译器。

我担心，GCJ依赖于GNU Classpath库，而这些库并没有完全覆盖Java 5类库。在Sun开源Java 6之后，类路径开发工作停滞不前。

您尝试编译的代码取决于Java 8 API。它们从未在Classpath中实现。这是你得到的编译错误的根本原因。

GCJ工具链现在已经死了。正如Wikipedia page所说：

  

截至2015年，GCJ没有宣布新的开发项目，产品处于维护模式。 GCJ于2016年9月30日从海湾合作委员会主干中移除。通过发布GCC 7.1（不包含GCC 7.1）宣布取消。 GCJ仍然是GCC 6的一部分。

如果您正在寻找可行的Java AOT（提前）编译器，请考虑：

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