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我在Ubuntu上使用R，我想使用CoreNLP軟件包，並且出現奇怪的行爲。當我使用一個shell，一切都很好，比如我可以運行：R中的CoreNLP，在RStudio中不起作用，但在外殼上工作正常
$ R
R version 3.2.2 (2015-08-14) -- "Fire Safety"
Copyright (C) 2015 The R Foundation for Statistical Computing
Platform: x86_64-pc-linux-gnu (64-bit)
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Natural language support but running in an English locale
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[Previously saved workspace restored]
> library(rjava)
Error in library(rjava) : there is no package called ‘rjava’
> library(rJava)
> library(coreNLP)
> initCoreNLP()
Searching for resource: config.properties
Adding annotator tokenize
TokenizerAnnotator: No tokenizer type provided. Defaulting to PTBTokenizer.
Adding annotator ssplit
Adding annotator pos
Reading POS tagger model from edu/stanford/nlp/models/pos-tagger/english-left3words/english-left3words-distsim.tagger ... done [2.4 sec].
Adding annotator lemma
Adding annotator ner
Loading classifier from edu/stanford/nlp/models/ner/english.all.3class.distsim.crf.ser.gz ... done [6.1 sec].
Loading classifier from edu/stanford/nlp/models/ner/english.muc.7class.distsim.crf.ser.gz ... done [4.1 sec].
Loading classifier from edu/stanford/nlp/models/ner/english.conll.4class.distsim.crf.ser.gz ... done [3.3 sec].
Initializing JollyDayHoliday for SUTime from classpath: edu/stanford/nlp/models/sutime/jollyday/Holidays_sutime.xml as sutime.binder.1.
Reading TokensRegex rules from edu/stanford/nlp/models/sutime/defs.sutime.txt
Reading TokensRegex rules from edu/stanford/nlp/models/sutime/english.sutime.txt
Reading TokensRegex rules from edu/stanford/nlp/models/sutime/english.holidays.sutime.txt
Adding annotator parse
Loading parser from serialized file edu/stanford/nlp/models/lexparser/englishPCFG.ser.gz ... done [4.1 sec].
Adding annotator dcoref
Adding annotator sentiment
> library(rJava)
> .jinit()
[1] 0
> .jcall("java/lang/System","S","getProperty","java.version")
[1] "1.8.0_91"
>
但是，如果使用RStudio服務器在同一臺機器上，用同一個用戶，我得到這個：
> library(rJava)
> library(coreNLP)
> initCoreNLP()
Error in rJava::.jnew("edu.stanford.nlp.pipeline.StanfordCoreNLP", basename(path)) :
java.lang.UnsupportedClassVersionError: edu/stanford/nlp/pipeline/StanfordCoreNLP : Unsupported major.minor version 52.0
> .jinit()
[1] 0
> .jcall("java/lang/System","S","getProperty","java.version")
[1] "1.7.0_67"
首先，這在終端或RStudio Server中都不起作用。爲了使其在終端工作，我按照這些步驟：
- 我下載的Java從http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html，jdk的-8u91-Linux的x64.tar.gz文件。
- 解壓在/usr/lib/jvm/jdk1.8.0_91
- 最後運行
sudo JAVA_HOME=/usr/lib/jvm/jdk1.8.0_91 R CMD javareconf
所以，我不明白爲什麼它工作在終端，但不是在RStudio服務器。似乎RStudio服務器無法加載正確的Java，有誰知道爲什麼？
非常感謝您的寶貴意見。
所有最優秀的
奧古斯丁